diff --git a/src/tools/automation-framework/core/base-action.js b/src/tools/automation-framework/core/base-action.js
index 7022244..aa8e57b 100644
--- a/src/tools/automation-framework/core/base-action.js
+++ b/src/tools/automation-framework/core/base-action.js
@@ -17,29 +17,96 @@ class BaseAction {
   }
   
   /**
-   * 替换配置中的变量
-   * @param {string} value - 包含变量的字符串 (如 "{{account.email}}")
+   * 替换配置中的变量（增强版）
+   * 
+   * 支持特性：
+   * - 多数据源：{{account.email}}, {{site.url}}, {{config.timeout}}
+   * - 默认值：{{var|default}}, {{user.name|Guest}}
+   * - 变量不存在时警告
+   * 
+   * @param {string} value - 包含变量的字符串
    * @returns {string} - 替换后的值
    */
   replaceVariables(value) {
     if (typeof value !== 'string') return value;
     
-    return value.replace(/\{\{(.+?)\}\}/g, (match, path) => {
-      const keys = path.trim().split('.');
-      let result = this.context.data;
+    return value.replace(/\{\{(.+?)\}\}/g, (match, expression) => {
+      // 解析默认值：{{var|default}}
+      const [path, defaultValue] = expression.split('|').map(s => s.trim());
       
-      for (const key of keys) {
-        if (result && typeof result === 'object') {
-          result = result[key];
-        } else {
-          return match; // 无法解析，返回原始值
-        }
+      // 获取变量值
+      const result = this.resolveVariablePath(path);
+      
+      // 如果找到值，返回
+      if (result !== undefined && result !== null) {
+        return result;
       }
       
-      return result !== undefined ? result : match;
+      // 如果有默认值，使用默认值
+      if (defaultValue !== undefined) {
+        this.log('debug', `变量 "${path}" 不存在，使用默认值: "${defaultValue}"`);
+        return defaultValue;
+      }
+      
+      // 变量不存在且无默认值，发出警告
+      this.log('warn', `⚠️ 变量 "${path}" 不存在，返回原始值: ${match}`);
+      return match;
     });
   }
   
+  /**
+   * 解析变量路径，支持多个数据源
+   * @param {string} path - 变量路径，如 "account.email" 或 "site.url"
+   * @returns {*} - 解析后的值
+   */
+  resolveVariablePath(path) {
+    const keys = path.split('.');
+    const rootKey = keys[0];
+    
+    // 确定数据源
+    let dataSource;
+    let startIndex = 1; // 从第二个key开始
+    
+    switch (rootKey) {
+      case 'site':
+        // {{site.url}} -> context.siteConfig.url
+        dataSource = this.context.siteConfig;
+        break;
+      
+      case 'config':
+        // {{config.timeout}} -> context.config
+        dataSource = this.context.config;
+        break;
+      
+      case 'env':
+        // {{env.API_KEY}} -> process.env
+        dataSource = process.env;
+        break;
+      
+      default:
+        // 默认从 context.data 读取
+        // {{account.email}} -> context.data.account.email
+        dataSource = this.context.data;
+        startIndex = 0; // 从第一个key开始
+    }
+    
+    if (!dataSource) {
+      return undefined;
+    }
+    
+    // 遍历路径获取值
+    let result = dataSource;
+    for (let i = startIndex; i < keys.length; i++) {
+      if (result && typeof result === 'object') {
+        result = result[keys[i]];
+      } else {
+        return undefined;
+      }
+    }
+    
+    return result;
+  }
+  
   /**
    * 记录日志
    */
diff --git a/src/tools/automation-framework/core/config-validator.js b/src/tools/automation-framework/core/config-validator.js
index a3aa7ef..6d8ff35 100644
--- a/src/tools/automation-framework/core/config-validator.js
+++ b/src/tools/automation-framework/core/config-validator.js
@@ -106,6 +106,9 @@ class ConfigValidator {
       }
     });
     
+    // 类型检查
+    errors.push(...this.validateFieldTypes(step, stepLabel));
+    
     // 检查未知字段（警告）
     const allFields = [...schema.required, ...schema.optional, 'action'];
     Object.keys(step).forEach(field => {
@@ -135,6 +138,47 @@ class ConfigValidator {
     return errors;
   }
   
+  /**
+   * 类型检查
+   */
+  validateFieldTypes(step, stepLabel) {
+    const errors = [];
+    
+    // fillForm 的 fields 应该是对象
+    if (step.action === 'fillForm' && step.fields) {
+      if (typeof step.fields !== 'object' || Array.isArray(step.fields)) {
+        errors.push(`${stepLabel}: fields 必须是对象类型`);
+      }
+    }
+    
+    // 数字类型字段检查
+    const numberFields = ['timeout', 'maxRetries', 'retryDelay', 'duration', 'totalTimeout', 'pollInterval'];
+    numberFields.forEach(field => {
+      if (step[field] !== undefined && typeof step[field] !== 'number') {
+        errors.push(`${stepLabel}: ${field} 必须是数字类型，当前为 ${typeof step[field]}`);
+      }
+    });
+    
+    // 布尔类型字段检查
+    const booleanFields = ['humanLike', 'optional', 'waitForEnabled'];
+    booleanFields.forEach(field => {
+      if (step[field] !== undefined && typeof step[field] !== 'boolean') {
+        errors.push(`${stepLabel}: ${field} 必须是布尔类型，当前为 ${typeof step[field]}`);
+      }
+    });
+    
+    // 数组类型字段检查
+    if (step.steps && !Array.isArray(step.steps)) {
+      errors.push(`${stepLabel}: steps 必须是数组类型`);
+    }
+    
+    if (step.verifyElements && !Array.isArray(step.verifyElements)) {
+      errors.push(`${stepLabel}: verifyElements 必须是数组类型`);
+    }
+    
+    return errors;
+  }
+  
   /**
    * 验证并打印结果
    */