diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/enums/SSHMessageType.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/enums/SSHMessageType.java
index 6e5c21c4..4c533187 100644
--- a/backend/src/main/java/com/qqchen/deploy/backend/framework/enums/SSHMessageType.java
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/enums/SSHMessageType.java
@@ -3,30 +3,36 @@ package com.qqchen.deploy.backend.framework.enums;
 import com.fasterxml.jackson.annotation.JsonValue;
 
 /**
- * SSH WebSocket消息类型枚举（Framework层）
+ * SSH WebSocket 消息类型枚举（Framework层）
  * 
- * 用于标识不同类型的SSH WebSocket消息
+ * 定义标准的SSH WebSocket消息类型
+ * 使用 @JsonValue 注解实现JSON序列化为小写字符串
  */
 public enum SSHMessageType {
     /**
-     * 用户输入（前端 → 后端）
+     * 用户输入消息（前端 → 后端）
      */
     INPUT("input"),
     
     /**
-     * 终端输出（后端 → 前端）
+     * SSH输出消息（后端 → 前端）
      */
     OUTPUT("output"),
     
     /**
-     * 连接状态（后端 → 前端）
+     * 连接状态消息（后端 → 前端）
      */
     STATUS("status"),
     
     /**
-     * 错误信息（后端 → 前端）
+     * 错误消息（后端 → 前端）
      */
-    ERROR("error");
+    ERROR("error"),
+    
+    /**
+     * 终端尺寸调整消息（前端 → 后端）
+     */
+    RESIZE("resize");
     
     private final String value;
     
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/AbstractSSHWebSocketHandler.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/AbstractSSHWebSocketHandler.java
index 4f89b266..6eb566ec 100644
--- a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/AbstractSSHWebSocketHandler.java
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/AbstractSSHWebSocketHandler.java
@@ -310,28 +310,84 @@ public abstract class AbstractSSHWebSocketHandler extends TextWebSocketHandler {
             SSHWebSocketMessage msg = JsonUtils.fromJson(message.getPayload(), SSHWebSocketMessage.class);
             
             if (msg.getType() == SSHMessageType.INPUT) {
-                // 用户输入命令
+                // 用户输入命令（使用强类型Request）
+                com.qqchen.deploy.backend.framework.ssh.websocket.request.SSHInputRequest request = 
+                    msg.getRequest(com.qqchen.deploy.backend.framework.ssh.websocket.request.SSHInputRequest.class);
+                
+                if (request == null || !request.isValid()) {
+                    log.warn("INPUT消息格式错误或为空: sessionId={}", sessionId);
+                    return;
+                }
+                
                 Session.Shell shell = sshShells.get(sessionId);
                 if (shell != null) {
                     OutputStream outputStream = shell.getOutputStream();
-                    outputStream.write(msg.getData().getBytes(StandardCharsets.UTF_8));
+                    outputStream.write(request.getCommand().getBytes(StandardCharsets.UTF_8));
                     outputStream.flush();
                     
                     // 触发命令事件
                     SSHTarget target = sessionTargets.get(sessionId);
                     SSHEventData eventData = SSHEventData.builder()
                         .sessionId(sessionId)
-                        .command(msg.getData())
+                        .command(request.getCommand())
                         .target(target)
                         .build();
                     onEvent(SSHEvent.ON_COMMAND, eventData);
                 }
+            } else if (msg.getType() == SSHMessageType.RESIZE) {
+                // 终端尺寸调整
+                handleResizeMessage(sessionId, msg);
             }
         } catch (Exception e) {
             log.error("处理WebSocket消息失败: sessionId={}", sessionId, e);
         }
     }
     
+    /**
+     * 处理终端尺寸调整消息（使用强类型Request）
+     * 
+     * @param sessionId 会话ID
+     * @param msg 消息对象
+     */
+    private void handleResizeMessage(String sessionId, SSHWebSocketMessage msg) {
+        try {
+            // 使用强类型提取request
+            com.qqchen.deploy.backend.framework.ssh.websocket.request.SSHResizeRequest request = 
+                msg.getRequest(com.qqchen.deploy.backend.framework.ssh.websocket.request.SSHResizeRequest.class);
+            
+            if (request == null) {
+                log.warn("RESIZE消息缺少request或格式错误: sessionId={}", sessionId);
+                return;
+            }
+            
+            // 验证参数
+            if (!request.isValid()) {
+                log.warn("RESIZE消息参数无效: sessionId={}, rows={}, cols={}", 
+                    sessionId, request.getRows(), request.getCols());
+                return;
+            }
+            
+            // 调整SSH PTY尺寸
+            Session.Shell shell = sshShells.get(sessionId);
+            if (shell != null) {
+                // 计算像素尺寸（标准字体：8x16像素）
+                int widthPixels = request.getCols() * 8;
+                int heightPixels = request.getRows() * 16;
+                
+                shell.changeWindowDimensions(request.getCols(), request.getRows(), 
+                    widthPixels, heightPixels);
+                    
+                log.debug("SSH终端尺寸已调整: sessionId={}, cols={}, rows={}", 
+                    sessionId, request.getCols(), request.getRows());
+            } else {
+                log.warn("未找到SSH Shell，无法调整尺寸: sessionId={}", sessionId);
+            }
+            
+        } catch (Exception e) {
+            log.error("处理RESIZE消息失败: sessionId={}", sessionId, e);
+        }
+    }
+    
     @Override
     public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
         String sessionId = getSessionId(session);
@@ -624,7 +680,7 @@ public abstract class AbstractSSHWebSocketHandler extends TextWebSocketHandler {
     }
     
     /**
-     * 发送输出消息到前端
+     * 发送输出消息到前端（使用强类型Response）
      * 
      * @param session WebSocket会话
      * @param output 输出内容
@@ -640,8 +696,16 @@ public abstract class AbstractSSHWebSocketHandler extends TextWebSocketHandler {
                 return;
             }
             
-            log.debug("  ├─ 创建SSHWebSocketMessage: sessionId={}", sessionId);
-            SSHWebSocketMessage msg = SSHWebSocketMessage.output(output);
+            // 创建强类型Response对象
+            com.qqchen.deploy.backend.framework.ssh.websocket.response.SSHOutputResponse response = 
+                new com.qqchen.deploy.backend.framework.ssh.websocket.response.SSHOutputResponse(output);
+            
+            // 包装成 {"response": SSHOutputResponse}
+            Map<String, Object> data = new HashMap<>();
+            data.put("response", response);
+            
+            // 创建消息
+            SSHWebSocketMessage msg = new SSHWebSocketMessage(SSHMessageType.OUTPUT, data);
             
             log.debug("  ├─ 准备调用session.sendMessage: sessionId={}", sessionId);
             session.sendMessage(new TextMessage(JsonUtils.toJson(msg)));
@@ -655,11 +719,25 @@ public abstract class AbstractSSHWebSocketHandler extends TextWebSocketHandler {
     }
     
     /**
-     * 发送状态消息到前端
+     * 发送状态消息到前端（使用强类型Response）
      */
     protected void sendStatus(WebSocketSession session, SSHStatusEnum status) {
         try {
-            SSHWebSocketMessage msg = SSHWebSocketMessage.status(status);
+            if (!session.isOpen()) {
+                log.debug("WebSocket已关闭，跳过发送状态: sessionId={}", session.getId());
+                return;
+            }
+            
+            // 创建强类型Response对象
+            com.qqchen.deploy.backend.framework.ssh.websocket.response.SSHStatusResponse response = 
+                new com.qqchen.deploy.backend.framework.ssh.websocket.response.SSHStatusResponse(status);
+            
+            // 包装成 {"response": SSHStatusResponse}
+            Map<String, Object> data = new HashMap<>();
+            data.put("response", response);
+            
+            // 创建消息
+            SSHWebSocketMessage msg = new SSHWebSocketMessage(SSHMessageType.STATUS, data);
             session.sendMessage(new TextMessage(JsonUtils.toJson(msg)));
         } catch (IOException e) {
             log.error("发送状态消息失败: sessionId={}", session.getId(), e);
@@ -667,7 +745,7 @@ public abstract class AbstractSSHWebSocketHandler extends TextWebSocketHandler {
     }
     
     /**
-     * 发送错误消息到前端
+     * 发送错误消息到前端（使用强类型Response）
      */
     protected void sendError(WebSocketSession session, String error) {
         try {
@@ -675,7 +753,17 @@ public abstract class AbstractSSHWebSocketHandler extends TextWebSocketHandler {
                 log.debug("WebSocket已关闭，跳过发送错误消息: sessionId={}", session.getId());
                 return;
             }
-            SSHWebSocketMessage msg = SSHWebSocketMessage.error(error);
+            
+            // 创建强类型Response对象
+            com.qqchen.deploy.backend.framework.ssh.websocket.response.SSHErrorResponse response = 
+                new com.qqchen.deploy.backend.framework.ssh.websocket.response.SSHErrorResponse(error);
+            
+            // 包装成 {"response": SSHErrorResponse}
+            Map<String, Object> data = new HashMap<>();
+            data.put("response", response);
+            
+            // 创建消息
+            SSHWebSocketMessage msg = new SSHWebSocketMessage(SSHMessageType.ERROR, data);
             session.sendMessage(new TextMessage(JsonUtils.toJson(msg)));
         } catch (IOException e) {
             if (session.isOpen()) {
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/SSHWebSocketMessage.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/SSHWebSocketMessage.java
index 6aadae2b..1a379da3 100644
--- a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/SSHWebSocketMessage.java
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/SSHWebSocketMessage.java
@@ -1,6 +1,7 @@
 package com.qqchen.deploy.backend.framework.ssh.websocket;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
 import com.qqchen.deploy.backend.framework.enums.SSHStatusEnum;
 import lombok.Data;
@@ -30,13 +31,23 @@ public class SSHWebSocketMessage {
     private SSHMessageType type;
     
     /**
-     * 消息内容（字符串）
+     * 消息内容（可以是字符串或对象）
+     * 
+     * 字符串类型（后端→前端）：
      * - type=OUTPUT: 终端输出内容
-     * - type=INPUT: 用户输入内容
      * - type=STATUS: 状态值（connecting/connected/reconnecting/disconnected/error）
      * - type=ERROR: 错误描述信息
+     * 
+     * 字符串类型（前端→后端）：
+     * - type=INPUT: 用户输入内容
+     * 
+     * 对象类型（前端→后端）：
+     * - type=RESIZE: {"request": {"rows": 40, "cols": 150}}
+     * 
+     * 对象类型（后端→前端，预留）：
+     * - 未来可能的response: {"response": {...}}
      */
-    private String data;
+    private Object data;
     
     /**
      * 消息时间戳（Unix毫秒）
@@ -46,14 +57,15 @@ public class SSHWebSocketMessage {
     
     /**
      * 可选元数据
-     * 通常为null，特殊场景下使用
+     * 
+     * 用于特殊场景的扩展字段，通常为null
      */
     private Map<String, Object> metadata;
     
     /**
      * 构造函数（自动填充时间戳）
      */
-    public SSHWebSocketMessage(SSHMessageType type, String data) {
+    public SSHWebSocketMessage(SSHMessageType type, Object data) {
         this.type = type;
         this.data = data;
         this.timestamp = System.currentTimeMillis();
@@ -94,4 +106,40 @@ public class SSHWebSocketMessage {
     public static SSHWebSocketMessage input(String data) {
         return new SSHWebSocketMessage(SSHMessageType.INPUT, data);
     }
+    
+    /**
+     * 从消息中提取request对象（强类型转换）
+     * 
+     * @param requestClass 请求类型
+     * @return 请求对象，如果解析失败返回null
+     */
+    @SuppressWarnings("unchecked")
+    public <T> T getRequest(Class<T> requestClass) {
+        try {
+            if (data instanceof Map) {
+                Map<String, Object> dataMap = (Map<String, Object>) data;
+                Object requestObj = dataMap.get("request");
+                
+                if (requestObj != null) {
+                    // 如果已经是目标类型，直接返回
+                    if (requestClass.isInstance(requestObj)) {
+                        return (T) requestObj;
+                    }
+                    // 否则使用ObjectMapper转换（Map -> POJO）
+                    ObjectMapper mapper = new ObjectMapper();
+                    return mapper.convertValue(requestObj, requestClass);
+                }
+            }
+        } catch (Exception e) {
+            // 转换失败，返回null
+        }
+        return null;
+    }
+    
+    /**
+     * 检查data是否包含request
+     */
+    public boolean hasRequest() {
+        return data instanceof Map && ((Map<?, ?>) data).containsKey("request");
+    }
 }
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHBaseRequest.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHBaseRequest.java
new file mode 100644
index 00000000..55c9687c
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHBaseRequest.java
@@ -0,0 +1,29 @@
+package com.qqchen.deploy.backend.framework.ssh.websocket.request;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
+import lombok.Data;
+
+/**
+ * SSH WebSocket请求基类（Framework层）
+ * 
+ * 所有前端发送到后端的请求消息都应该继承此类
+ * 使用Jackson的@JsonTypeInfo和@JsonSubTypes实现多态反序列化
+ */
+@Data
+@JsonTypeInfo(
+    use = JsonTypeInfo.Id.NAME,
+    property = "type",
+    visible = true
+)
+@JsonSubTypes({
+    @JsonSubTypes.Type(value = SSHInputRequest.class, name = "input"),
+    @JsonSubTypes.Type(value = SSHResizeRequest.class, name = "resize")
+})
+public abstract class SSHBaseRequest {
+    /**
+     * 请求类型（使用枚举保证类型安全）
+     */
+    private SSHMessageType type;
+}
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHInputRequest.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHInputRequest.java
new file mode 100644
index 00000000..d54d9e90
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHInputRequest.java
@@ -0,0 +1,45 @@
+package com.qqchen.deploy.backend.framework.ssh.websocket.request;
+
+import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+/**
+ * SSH用户输入请求（Framework层）
+ * 
+ * 前端发送格式：
+ * {
+ *   "type": "input",
+ *   "data": {
+ *     "request": {
+ *       "type": "input",
+ *       "command": "ls -la"
+ *     }
+ *   }
+ * }
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class SSHInputRequest extends SSHBaseRequest {
+    
+    /**
+     * 用户输入命令（终端命令或字符）
+     */
+    private String command;
+    
+    public SSHInputRequest() {
+        setType(SSHMessageType.INPUT);
+    }
+    
+    public SSHInputRequest(String command) {
+        this();
+        this.command = command;
+    }
+    
+    /**
+     * 验证参数有效性
+     */
+    public boolean isValid() {
+        return command != null && !command.isEmpty();
+    }
+}
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHResizeRequest.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHResizeRequest.java
new file mode 100644
index 00000000..bbbeed21
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/request/SSHResizeRequest.java
@@ -0,0 +1,45 @@
+package com.qqchen.deploy.backend.framework.ssh.websocket.request;
+
+import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+/**
+ * SSH终端尺寸调整请求（Framework层）
+ * 
+ * 前端发送格式：
+ * {
+ *   "type": "resize",
+ *   "data": {
+ *     "request": {
+ *       "rows": 40,
+ *       "cols": 150
+ *     }
+ *   }
+ * }
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class SSHResizeRequest extends SSHBaseRequest {
+    
+    /**
+     * 终端行数
+     */
+    private Integer rows;
+    
+    /**
+     * 终端列数
+     */
+    private Integer cols;
+    
+    public SSHResizeRequest() {
+        setType(SSHMessageType.RESIZE);
+    }
+    
+    /**
+     * 验证参数有效性
+     */
+    public boolean isValid() {
+        return rows != null && cols != null && rows > 0 && cols > 0;
+    }
+}
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHBaseResponse.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHBaseResponse.java
new file mode 100644
index 00000000..97eb1b47
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHBaseResponse.java
@@ -0,0 +1,38 @@
+package com.qqchen.deploy.backend.framework.ssh.websocket.response;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
+import lombok.Data;
+
+/**
+ * SSH WebSocket响应基类（Framework层）
+ * 
+ * 所有后端发送到前端的响应消息都应该继承此类
+ * 使用Jackson的@JsonTypeInfo和@JsonSubTypes实现多态序列化
+ */
+@Data
+@JsonTypeInfo(
+    use = JsonTypeInfo.Id.NAME,
+    property = "type",
+    visible = true
+)
+@JsonSubTypes({
+    @JsonSubTypes.Type(value = SSHOutputResponse.class, name = "output"),
+    @JsonSubTypes.Type(value = SSHStatusResponse.class, name = "status"),
+    @JsonSubTypes.Type(value = SSHErrorResponse.class, name = "error")
+})
+public abstract class SSHBaseResponse {
+    /**
+     * 响应类型（使用枚举保证类型安全）
+     */
+    private SSHMessageType type;
+    
+    /**
+     * 响应数据（统一字段）
+     * - OUTPUT: 终端输出内容
+     * - STATUS: 状态值（connected/disconnected等）
+     * - ERROR: 错误消息
+     */
+    private String data;
+}
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHErrorResponse.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHErrorResponse.java
new file mode 100644
index 00000000..43ec4e21
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHErrorResponse.java
@@ -0,0 +1,34 @@
+package com.qqchen.deploy.backend.framework.ssh.websocket.response;
+
+import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+/**
+ * SSH错误响应（Framework层）
+ * 
+ * 后端发送格式：
+ * {
+ *   "type": "error",
+ *   "data": {
+ *     "response": {
+ *       "type": "error",
+ *       "data": "Connection failed"
+ *     }
+ *   }
+ * }
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class SSHErrorResponse extends SSHBaseResponse {
+    
+    public SSHErrorResponse() {
+        setType(SSHMessageType.ERROR);
+    }
+    
+    public SSHErrorResponse(String message) {
+        this();
+        setType(SSHMessageType.ERROR);
+        setData(message);
+    }
+}
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHOutputResponse.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHOutputResponse.java
new file mode 100644
index 00000000..7a51e020
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHOutputResponse.java
@@ -0,0 +1,34 @@
+package com.qqchen.deploy.backend.framework.ssh.websocket.response;
+
+import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+/**
+ * SSH终端输出响应（Framework层）
+ * 
+ * 后端发送格式：
+ * {
+ *   "type": "output",
+ *   "data": {
+ *     "response": {
+ *       "type": "output",
+ *       "data": "terminal output text"
+ *     }
+ *   }
+ * }
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class SSHOutputResponse extends SSHBaseResponse {
+    
+    public SSHOutputResponse() {
+        setType(SSHMessageType.OUTPUT);
+    }
+    
+    public SSHOutputResponse(String data) {
+        this();
+        setType(SSHMessageType.OUTPUT);
+        setData(data);
+    }
+}
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHStatusResponse.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHStatusResponse.java
new file mode 100644
index 00000000..92804a61
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/ssh/websocket/response/SSHStatusResponse.java
@@ -0,0 +1,41 @@
+package com.qqchen.deploy.backend.framework.ssh.websocket.response;
+
+import com.qqchen.deploy.backend.framework.enums.SSHMessageType;
+import com.qqchen.deploy.backend.framework.enums.SSHStatusEnum;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+/**
+ * SSH连接状态响应（Framework层）
+ * 
+ * 后端发送格式：
+ * {
+ *   "type": "status",
+ *   "data": {
+ *     "response": {
+ *       "type": "status",
+ *       "data": "connected"
+ *     }
+ *   }
+ * }
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class SSHStatusResponse extends SSHBaseResponse {
+    
+    public SSHStatusResponse() {
+        setType(SSHMessageType.STATUS);
+    }
+    
+    public SSHStatusResponse(SSHStatusEnum status) {
+        this();
+        setType(SSHMessageType.STATUS);
+        setData(status.name().toLowerCase());
+    }
+    
+    public SSHStatusResponse(String status) {
+        this();
+        setType(SSHMessageType.STATUS);
+        setData(status);
+    }
+}