diff --git a/backend/api/handlers.go b/backend/api/handlers.go
index e29a844..9f59c10 100644
--- a/backend/api/handlers.go
+++ b/backend/api/handlers.go
@@ -50,6 +50,14 @@ type ChatCompletionMessage struct {
 	Content string `json:"content"`
 }
 
+// BackendChatCompletionRequest 是实际发送到后端模型的请求结构
+// 它只包含通用字段，以避免发送不被支持的参数
+type BackendChatCompletionRequest struct {
+	Model    string                  `json:"model"`
+	Messages []ChatCompletionMessage `json:"messages"`
+	Stream   bool                    `json:"stream,omitempty"`
+}
+
 // ResponsesRequest /v1/responses 端点请求结构
 type ResponsesRequest struct {
 	Model    string                  `json:"model"`
@@ -119,8 +127,13 @@ func (h *APIHandler) ChatCompletions(c *gin.Context) {
 
 	var req ChatCompletionRequest
 
+	// 增加日志记录请求体
+	bodyBytes, _ := io.ReadAll(c.Request.Body)
+	c.Request.Body = io.NopCloser(bytes.NewBuffer(bodyBytes)) // 把body重新写回去
+
 	// 解析请求体
 	if err := c.ShouldBindJSON(&req); err != nil {
+		log.Printf("Failed to bind JSON: %v", err) // 增加错误日志
 		c.JSON(http.StatusBadRequest, gin.H{
 			"error": gin.H{
 				"message": "Invalid request format",
@@ -146,7 +159,22 @@ func (h *APIHandler) ChatCompletions(c *gin.Context) {
 	}
 
 	// 准备转发请求
-	requestBody, err := json.Marshal(req)
+	// 用body创建一个json对象
+	var jsonBody map[string]interface{}
+	if err := json.Unmarshal(bodyBytes, &jsonBody); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error": gin.H{
+				"message": "Failed to process request",
+				"type":    "internal_error",
+			},
+		})
+		return
+	}
+	// 然后修改jsonBody的model字段
+	jsonBody["model"] = backendModel.Name
+	// 最后重新marshal回requestBody
+	requestBody, err := json.Marshal(jsonBody)
+
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{
 			"error": gin.H{
@@ -212,6 +240,10 @@ func (h *APIHandler) ChatCompletions(c *gin.Context) {
 		return
 	}
 
+	// 增加日志记录后端响应
+	log.Printf("Backend Response Status: %s", resp.Status)
+	log.Printf("Backend Response Body: %s", string(responseBody))
+
 	// 计算响应token数
 	responseTokenCount := 0
 	var responseData map[string]interface{}
diff --git a/backend/gateway.db b/backend/gateway.db
index b07dd92..e3abd2f 100644
Binary files a/backend/gateway.db and b/backend/gateway.db differ
diff --git a/backend/internal/models/schema.go b/backend/internal/models/schema.go
index da8ce0d..012cf3c 100644
--- a/backend/internal/models/schema.go
+++ b/backend/internal/models/schema.go
@@ -15,9 +15,10 @@ const (
 // Provider 代表一个AI服务提供商
 type Provider struct {
 	gorm.Model
-	Name    string `gorm:"uniqueIndex;not null"` // 服务商名称，唯一索引
-	BaseURL string `gorm:"not null"`             // API基础URL
-	ApiKey  string `gorm:"not null"`             // API密钥
+	Name       string `gorm:"uniqueIndex;not null" json:"name"` // 服务商名称，唯一索引
+	BaseURL    string `gorm:"not null" json:"base_url"`         // API基础URL
+	ApiKey     string `gorm:"not null" json:"api_key"`          // API密钥
+	APIVersion string `json:"api_version"`                      // API版本（可选）
 }
 
 // APIKey 用于网关本身的API认证
diff --git a/backend/internal/router/selector.go b/backend/internal/router/selector.go
index a7cf55b..3068c4d 100644
--- a/backend/internal/router/selector.go
+++ b/backend/internal/router/selector.go
@@ -32,7 +32,7 @@ func SelectBackendModel(db *gorm.DB, virtualModelName string, requestTokenCount
 	// 筛选满足上下文长度要求的模型
 	var suitableModels []models.BackendModel
 	for _, backendModel := range virtualModel.BackendModels {
-		if backendModel.MaxContextLength >= requestTokenCount {
+		if backendModel.MaxContextLength == 0 || backendModel.MaxContextLength >= requestTokenCount {
 			suitableModels = append(suitableModels, backendModel)
 		}
 	}
@@ -67,11 +67,14 @@ func SelectBackendModel(db *gorm.DB, virtualModelName string, requestTokenCount
 			estimatedCost = model.FixedPrice
 		}
 
-		// 如果该模型设置了成本阈值，检查成本是否超过阈值
-		if model.CostThreshold > 0 {
-			// 如果成本超过该模型的阈值，跳过该模型
-			if estimatedCost > model.CostThreshold {
-				continue
+		// 如果CostThreshold不为0，则表示设置了成本阈值
+		if model.CostThreshold != 0 {
+			// 如果该模型设置了成本阈值，检查成本是否超过阈值
+			if model.CostThreshold > 0 {
+				// 如果成本超过该模型的阈值，跳过该模型
+				if estimatedCost > model.CostThreshold {
+					continue
+				}
 			}
 		}
 
diff --git a/backend/main.go b/backend/main.go
index 1c7d073..696ab94 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -39,13 +39,20 @@ func main() {
 		DB: database,
 	}
 
+	// 创建根组
+	root_ := router.Group("/")
+	root_.Use(middleware.AuthMiddleware(database))
+	{
+		root_.GET("/models", handler.ListModels)
+	}
+
 	// 创建受保护的路由组
-	protected := router.Group("/")
+	protected := router.Group("/v1")
 	protected.Use(middleware.AuthMiddleware(database))
 	{
 		protected.GET("/models", handler.ListModels)
-		protected.POST("/v1/chat/completions", handler.ChatCompletions)
-		protected.POST("/v1/responses", handler.ResponsesCompletions)
+		protected.POST("/chat/completions", handler.ChatCompletions)
+		protected.POST("/responses", handler.ResponsesCompletions)
 	}
 
 	// 创建API管理路由组
diff --git a/frontend/src/features/providers/components/ProviderForm.jsx b/frontend/src/features/providers/components/ProviderForm.jsx
index 7d17cb7..b0813d3 100644
--- a/frontend/src/features/providers/components/ProviderForm.jsx
+++ b/frontend/src/features/providers/components/ProviderForm.jsx
@@ -8,20 +8,20 @@ const ProviderForm = ({ provider, onSave, onCancel }) => {
 
   useEffect(() => {
     if (provider) {
-      setName(provider.Name || '');
-      setBaseURL(provider.BaseURL || '');
-      setAPIKey(provider.APIKey || '');
-      setAPIVersion(provider.APIVersion || '');
+      setName(provider.name || '');
+      setBaseURL(provider.base_url || '');
+      setAPIKey(provider.api_key || '');
+      setAPIVersion(provider.api_version || '');
     }
   }, [provider]);
 
   const handleSubmit = (e) => {
     e.preventDefault();
     onSave({
-      Name: name,
-      BaseURL: baseURL,
-      APIKey: apiKey,
-      APIVersion: apiVersion,
+      name: name,
+      base_url: baseURL,
+      api_key: apiKey,
+      api_version: apiVersion,
     });
   };
 
diff --git a/frontend/src/features/providers/components/ProviderList.jsx b/frontend/src/features/providers/components/ProviderList.jsx
index e5e0acc..f0a9768 100644
--- a/frontend/src/features/providers/components/ProviderList.jsx
+++ b/frontend/src/features/providers/components/ProviderList.jsx
@@ -138,12 +138,12 @@ const ProviderList = () => {
                 <tr key={provider.ID || index} className="hover:bg-gray-50 transition-colors">
                   <td className="px-6 py-4 whitespace-nowrap">
                     <div className="text-sm font-medium text-gray-900">
-                      {provider.Name || 'N/A'}
+                      {provider.name || 'N/A'}
                     </div>
                   </td>
                   <td className="px-6 py-4 whitespace-nowrap">
                     <span className="px-2 inline-flex text-xs leading-5 font-semibold rounded-full bg-blue-100 text-blue-800">
-                      {provider.BaseURL || 'N/A'}
+                      {provider.base_url || 'N/A'}
                     </span>
                   </td>
                   <td className="px-6 py-4 whitespace-nowrap text-sm font-medium">
diff --git a/frontend/src/features/virtual-models/components/VirtualModelForm.jsx b/frontend/src/features/virtual-models/components/VirtualModelForm.jsx
index 7231ff1..1a9152a 100644
--- a/frontend/src/features/virtual-models/components/VirtualModelForm.jsx
+++ b/frontend/src/features/virtual-models/components/VirtualModelForm.jsx
@@ -79,11 +79,13 @@ const VirtualModelForm = ({ model, onSave, onCancel }) => {
               className="mt-1 block w-full rounded-md border-gray-300 shadow-sm"
             >
               <option value={0}>选择提供商</option>
-              {providers.map((p) => (
-                <option key={p.ID} value={p.ID}>
-                  {p.Name}
-                </option>
-              ))}
+              {providers.map((p) => {
+                return (
+                  <option key={p.ID} value={p.ID}>
+                    {p.name}
+                  </option>
+                );
+              })}
             </select>
           </div>
           <div>