diff --git a/src/routes/openaiRoutes.js b/src/routes/openaiRoutes.js
index 07c7bcdc..a18f6d4a 100644
--- a/src/routes/openaiRoutes.js
+++ b/src/routes/openaiRoutes.js
@@ -168,7 +168,9 @@ router.post('/responses', authenticateApiKey, async (req, res) => {
     // 如果有代理，添加代理配置
     if (proxyAgent) {
       axiosConfig.httpsAgent = proxyAgent
-      logger.info('Using proxy for OpenAI request')
+      logger.info(`🌐 Using proxy for OpenAI request: ${ProxyHelper.getProxyDescription(proxy)}`)
+    } else {
+      logger.debug('🌐 No proxy configured for OpenAI request')
     }
 
     // 根据 stream 参数决定请求类型
diff --git a/src/services/claudeAccountService.js b/src/services/claudeAccountService.js
index 1195c370..7ef2c2d9 100644
--- a/src/services/claudeAccountService.js
+++ b/src/services/claudeAccountService.js
@@ -862,7 +862,17 @@ class ClaudeAccountService {
 
   // 🌐 创建代理agent（使用统一的代理工具）
   _createProxyAgent(proxyConfig) {
-    return ProxyHelper.createProxyAgent(proxyConfig)
+    const proxyAgent = ProxyHelper.createProxyAgent(proxyConfig)
+    if (proxyAgent) {
+      logger.info(
+        `🌐 Using proxy for Claude request: ${ProxyHelper.getProxyDescription(proxyConfig)}`
+      )
+    } else if (proxyConfig) {
+      logger.debug('🌐 Failed to create proxy agent for Claude')
+    } else {
+      logger.debug('🌐 No proxy configured for Claude request')
+    }
+    return proxyAgent
   }
 
   // 🔐 加密敏感数据
diff --git a/src/services/claudeConsoleAccountService.js b/src/services/claudeConsoleAccountService.js
index 73dc50b3..30b53fff 100644
--- a/src/services/claudeConsoleAccountService.js
+++ b/src/services/claudeConsoleAccountService.js
@@ -481,7 +481,17 @@ class ClaudeConsoleAccountService {
 
   // 🌐 创建代理agent（使用统一的代理工具）
   _createProxyAgent(proxyConfig) {
-    return ProxyHelper.createProxyAgent(proxyConfig)
+    const proxyAgent = ProxyHelper.createProxyAgent(proxyConfig)
+    if (proxyAgent) {
+      logger.info(
+        `🌐 Using proxy for Claude Console request: ${ProxyHelper.getProxyDescription(proxyConfig)}`
+      )
+    } else if (proxyConfig) {
+      logger.debug('🌐 Failed to create proxy agent for Claude Console')
+    } else {
+      logger.debug('🌐 No proxy configured for Claude Console request')
+    }
+    return proxyAgent
   }
 
   // 🔐 加密敏感数据
diff --git a/src/services/claudeRelayService.js b/src/services/claudeRelayService.js
index dcf087ff..cb7949bd 100644
--- a/src/services/claudeRelayService.js
+++ b/src/services/claudeRelayService.js
@@ -502,10 +502,17 @@ class ClaudeRelayService {
       const account = accountData.find((acc) => acc.id === accountId)
 
       if (!account || !account.proxy) {
+        logger.debug('🌐 No proxy configured for Claude account')
         return null
       }
 
-      return ProxyHelper.createProxyAgent(account.proxy)
+      const proxyAgent = ProxyHelper.createProxyAgent(account.proxy)
+      if (proxyAgent) {
+        logger.info(
+          `🌐 Using proxy for Claude request: ${ProxyHelper.getProxyDescription(account.proxy)}`
+        )
+      }
+      return proxyAgent
     } catch (error) {
       logger.warn('⚠️ Failed to create proxy agent:', error)
       return null
diff --git a/src/services/geminiAccountService.js b/src/services/geminiAccountService.js
index a63ffc99..58d0b76d 100644
--- a/src/services/geminiAccountService.js
+++ b/src/services/geminiAccountService.js
@@ -5,6 +5,7 @@ const config = require('../../config/config')
 const logger = require('../utils/logger')
 const { OAuth2Client } = require('google-auth-library')
 const { maskToken } = require('../utils/tokenMask')
+const ProxyHelper = require('../utils/proxyHelper')
 const {
   logRefreshStart,
   logRefreshSuccess,
@@ -228,7 +229,7 @@ async function exchangeCodeForTokens(code, redirectUri = null, codeVerifier = nu
 }
 
 // 刷新访问令牌
-async function refreshAccessToken(refreshToken) {
+async function refreshAccessToken(refreshToken, proxyConfig = null) {
   const oAuth2Client = createOAuth2Client()
 
   try {
@@ -237,6 +238,20 @@ async function refreshAccessToken(refreshToken) {
       refresh_token: refreshToken
     })
 
+    // 配置代理（如果提供）
+    const proxyAgent = ProxyHelper.createProxyAgent(proxyConfig)
+    if (proxyAgent) {
+      // Google Auth Library 使用 Axios，可以通过 transportOptions 配置代理
+      oAuth2Client.transportOptions = {
+        httpsAgent: proxyAgent
+      }
+      logger.info(
+        `🔄 Using proxy for Gemini token refresh: ${ProxyHelper.maskProxyInfo(proxyConfig)}`
+      )
+    } else {
+      logger.debug('🔄 No proxy configured for Gemini token refresh')
+    }
+
     // 调用 refreshAccessToken 获取新的 tokens
     const response = await oAuth2Client.refreshAccessToken()
     const { credentials } = response
@@ -261,7 +276,9 @@ async function refreshAccessToken(refreshToken) {
     logger.error('Error refreshing access token:', {
       message: error.message,
       code: error.code,
-      response: error.response?.data
+      response: error.response?.data,
+      hasProxy: !!proxyConfig,
+      proxy: proxyConfig ? ProxyHelper.maskProxyInfo(proxyConfig) : 'No proxy'
     })
     throw new Error(`Failed to refresh access token: ${error.message}`)
   }
@@ -786,7 +803,8 @@ async function refreshAccountToken(accountId) {
     logger.info(`🔄 Starting token refresh for Gemini account: ${account.name} (${accountId})`)
 
     // account.refreshToken 已经是解密后的值（从 getAccount 返回）
-    const newTokens = await refreshAccessToken(account.refreshToken)
+    // 传入账户的代理配置
+    const newTokens = await refreshAccessToken(account.refreshToken, account.proxy)
 
     // 更新账户信息
     const updates = {
diff --git a/src/services/geminiRelayService.js b/src/services/geminiRelayService.js
index 0a3f560b..60030d3e 100644
--- a/src/services/geminiRelayService.js
+++ b/src/services/geminiRelayService.js
@@ -280,7 +280,9 @@ async function sendGeminiRequest({
   const proxyAgent = createProxyAgent(proxy)
   if (proxyAgent) {
     axiosConfig.httpsAgent = proxyAgent
-    logger.debug('Using proxy for Gemini request')
+    logger.info(`🌐 Using proxy for Gemini API request: ${ProxyHelper.getProxyDescription(proxy)}`)
+  } else {
+    logger.debug('🌐 No proxy configured for Gemini API request')
   }
 
   // 添加 AbortController 信号支持
@@ -386,6 +388,11 @@ async function getAvailableModels(accessToken, proxy, projectId, location = 'us-
   const proxyAgent = createProxyAgent(proxy)
   if (proxyAgent) {
     axiosConfig.httpsAgent = proxyAgent
+    logger.info(
+      `🌐 Using proxy for Gemini models request: ${ProxyHelper.getProxyDescription(proxy)}`
+    )
+  } else {
+    logger.debug('🌐 No proxy configured for Gemini models request')
   }
 
   try {
@@ -482,7 +489,11 @@ async function countTokens({
   const proxyAgent = createProxyAgent(proxy)
   if (proxyAgent) {
     axiosConfig.httpsAgent = proxyAgent
-    logger.debug('Using proxy for Gemini countTokens request')
+    logger.info(
+      `🌐 Using proxy for Gemini countTokens request: ${ProxyHelper.getProxyDescription(proxy)}`
+    )
+  } else {
+    logger.debug('🌐 No proxy configured for Gemini countTokens request')
   }
 
   try {
diff --git a/src/services/openaiAccountService.js b/src/services/openaiAccountService.js
index d4d1abae..1e88cdec 100644
--- a/src/services/openaiAccountService.js
+++ b/src/services/openaiAccountService.js
@@ -135,6 +135,11 @@ async function refreshAccessToken(refreshToken, proxy = null) {
     const proxyAgent = ProxyHelper.createProxyAgent(proxy)
     if (proxyAgent) {
       requestOptions.httpsAgent = proxyAgent
+      logger.info(
+        `🌐 Using proxy for OpenAI token refresh: ${ProxyHelper.getProxyDescription(proxy)}`
+      )
+    } else {
+      logger.debug('🌐 No proxy configured for OpenAI token refresh')
     }
 
     // 发送请求
diff --git a/src/utils/logger.js b/src/utils/logger.js
index 97a345bc..ac4cd618 100644
--- a/src/utils/logger.js
+++ b/src/utils/logger.js
@@ -5,7 +5,7 @@ const path = require('path')
 const fs = require('fs')
 const os = require('os')
 
-// 安全的 JSON 序列化函数，处理循环引用
+// 安全的 JSON 序列化函数，处理循环引用和特殊字符
 const safeStringify = (obj, maxDepth = 3, fullDepth = false) => {
   const seen = new WeakSet()
   // 如果是fullDepth模式，增加深度限制
@@ -16,6 +16,28 @@ const safeStringify = (obj, maxDepth = 3, fullDepth = false) => {
       return '[Max Depth Reached]'
     }
 
+    // 处理字符串值，清理可能导致JSON解析错误的特殊字符
+    if (typeof value === 'string') {
+      try {
+        // 移除或转义可能导致JSON解析错误的字符
+        let cleanValue = value
+          // eslint-disable-next-line no-control-regex
+          .replace(/[\u0000-\u0008\u000B\u000C\u000E-\u001F\u007F]/g, '') // 移除控制字符
+          .replace(/[\uD800-\uDFFF]/g, '') // 移除孤立的代理对字符
+          // eslint-disable-next-line no-control-regex
+          .replace(/\u0000/g, '') // 移除NUL字节
+
+        // 如果字符串过长，截断并添加省略号
+        if (cleanValue.length > 1000) {
+          cleanValue = `${cleanValue.substring(0, 997)}...`
+        }
+
+        return cleanValue
+      } catch (error) {
+        return '[Invalid String Data]'
+      }
+    }
+
     if (value !== null && typeof value === 'object') {
       if (seen.has(value)) {
         return '[Circular Reference]'
@@ -40,7 +62,10 @@ const safeStringify = (obj, maxDepth = 3, fullDepth = false) => {
       } else {
         const result = {}
         for (const [k, v] of Object.entries(value)) {
-          result[k] = replacer(k, v, depth + 1)
+          // 确保键名也是安全的
+          // eslint-disable-next-line no-control-regex
+          const safeKey = typeof k === 'string' ? k.replace(/[\u0000-\u001F\u007F]/g, '') : k
+          result[safeKey] = replacer(safeKey, v, depth + 1)
         }
         return result
       }
@@ -50,9 +75,20 @@ const safeStringify = (obj, maxDepth = 3, fullDepth = false) => {
   }
 
   try {
-    return JSON.stringify(replacer('', obj))
+    const processed = replacer('', obj)
+    return JSON.stringify(processed)
   } catch (error) {
-    return JSON.stringify({ error: 'Failed to serialize object', message: error.message })
+    // 如果JSON.stringify仍然失败，使用更保守的方法
+    try {
+      return JSON.stringify({
+        error: 'Failed to serialize object',
+        message: error.message,
+        type: typeof obj,
+        keys: obj && typeof obj === 'object' ? Object.keys(obj) : undefined
+      })
+    } catch (finalError) {
+      return '{"error":"Critical serialization failure","message":"Unable to serialize any data"}'
+    }
   }
 }
 
diff --git a/src/utils/oauthHelper.js b/src/utils/oauthHelper.js
index 84cd2554..ac33b71e 100644
--- a/src/utils/oauthHelper.js
+++ b/src/utils/oauthHelper.js
@@ -157,6 +157,14 @@ async function exchangeCodeForTokens(authorizationCode, codeVerifier, state, pro
   const agent = createProxyAgent(proxyConfig)
 
   try {
+    if (agent) {
+      logger.info(
+        `🌐 Using proxy for OAuth token exchange: ${ProxyHelper.maskProxyInfo(proxyConfig)}`
+      )
+    } else {
+      logger.debug('🌐 No proxy configured for OAuth token exchange')
+    }
+
     logger.debug('🔄 Attempting OAuth token exchange', {
       url: OAUTH_CONFIG.TOKEN_URL,
       codeLength: cleanedCode.length,
@@ -354,6 +362,14 @@ async function exchangeSetupTokenCode(authorizationCode, codeVerifier, state, pr
   const agent = createProxyAgent(proxyConfig)
 
   try {
+    if (agent) {
+      logger.info(
+        `🌐 Using proxy for Setup Token exchange: ${ProxyHelper.maskProxyInfo(proxyConfig)}`
+      )
+    } else {
+      logger.debug('🌐 No proxy configured for Setup Token exchange')
+    }
+
     logger.debug('🔄 Attempting Setup Token exchange', {
       url: OAUTH_CONFIG.TOKEN_URL,
       codeLength: cleanedCode.length,
diff --git a/src/utils/proxyHelper.js b/src/utils/proxyHelper.js
index 7bf2da86..ca409e62 100644
--- a/src/utils/proxyHelper.js
+++ b/src/utils/proxyHelper.js
@@ -163,6 +163,39 @@ class ProxyHelper {
     }
   }
 
+  /**
+   * 脱敏代理配置信息用于日志记录
+   * @param {object|string} proxyConfig - 代理配置
+   * @returns {string} 脱敏后的代理信息
+   */
+  static maskProxyInfo(proxyConfig) {
+    if (!proxyConfig) {
+      return 'No proxy'
+    }
+
+    try {
+      const proxy = typeof proxyConfig === 'string' ? JSON.parse(proxyConfig) : proxyConfig
+
+      let proxyDesc = `${proxy.type}://${proxy.host}:${proxy.port}`
+
+      // 如果有认证信息，进行脱敏处理
+      if (proxy.username && proxy.password) {
+        const maskedUsername =
+          proxy.username.length <= 2
+            ? proxy.username
+            : proxy.username[0] +
+              '*'.repeat(Math.max(1, proxy.username.length - 2)) +
+              proxy.username.slice(-1)
+        const maskedPassword = '*'.repeat(Math.min(8, proxy.password.length))
+        proxyDesc += ` (auth: ${maskedUsername}:${maskedPassword})`
+      }
+
+      return proxyDesc
+    } catch (error) {
+      return 'Invalid proxy config'
+    }
+  }
+
   /**
    * 创建代理 Agent（兼容旧的函数接口）
    * @param {object|string|null} proxyConfig - 代理配置