diff --git a/controller/relay.go b/controller/relay.go
index 4fba947f74cc..9818911126a0 100644
--- a/controller/relay.go
+++ b/controller/relay.go
@@ -180,16 +180,20 @@ func Relay(c *gin.Context, relayFormat types.RelayFormat) {
 	}
 
 	for ; retryParam.GetRetry() <= common.RetryTimes; retryParam.IncreaseRetry() {
+		logger.LogDebug(c, "渠道请求开始: retry=%d/%d, model=%q, relay_mode=%d, token_group=%q, using_group=%q", retryParam.GetRetry(), common.RetryTimes, relayInfo.OriginModelName, relayInfo.RelayMode, relayInfo.TokenGroup, relayInfo.UsingGroup)
 		channel, channelErr := getChannel(c, relayInfo, retryParam)
 		if channelErr != nil {
+			logger.LogDebug(c, "渠道选择失败: retry=%d, err=%s", retryParam.GetRetry(), channelErr.Error())
 			logger.LogError(c, channelErr.Error())
 			newAPIError = channelErr
 			break
 		}
 
+		logger.LogDebug(c, "渠道选择成功: retry=%d, channel_id=%d, channel_type=%d, channel_name=%q", retryParam.GetRetry(), channel.Id, channel.Type, channel.Name)
 		addUsedChannel(c, channel.Id)
 		requestBody, bodyErr := common.GetRequestBody(c)
 		if bodyErr != nil {
+			logger.LogDebug(c, "读取请求体失败: retry=%d, err=%s", retryParam.GetRetry(), bodyErr.Error())
 			// Ensure consistent 413 for oversized bodies even when error occurs later (e.g., retry path)
 			if common.IsRequestBodyTooLargeError(bodyErr) || errors.Is(bodyErr, common.ErrRequestBodyTooLarge) {
 				newAPIError = types.NewErrorWithStatusCode(bodyErr, types.ErrorCodeReadRequestBodyFailed, http.StatusRequestEntityTooLarge, types.ErrOptionWithSkipRetry())
@@ -212,14 +216,19 @@ func Relay(c *gin.Context, relayFormat types.RelayFormat) {
 		}
 
 		if newAPIError == nil {
+			logger.LogDebug(c, "渠道请求成功: retry=%d, channel_id=%d", retryParam.GetRetry(), channel.Id)
 			return
 		}
 
+		logger.LogDebug(c, "渠道请求失败: retry=%d, channel_id=%d, status=%d, err=%s", retryParam.GetRetry(), channel.Id, newAPIError.StatusCode, newAPIError.Error())
 		processChannelError(c, *types.NewChannelError(channel.Id, channel.Type, channel.Name, channel.ChannelInfo.IsMultiKey, common.GetContextKeyString(c, constant.ContextKeyChannelKey), channel.GetAutoBan()), newAPIError)
 
-		if !shouldRetry(c, newAPIError, common.RetryTimes-retryParam.GetRetry()) {
+		remainTimes := common.RetryTimes - retryParam.GetRetry()
+		if !shouldRetry(c, newAPIError, remainTimes) {
+			logger.LogDebug(c, "渠道重试结束: retry=%d, remaining=%d, channel_id=%d", retryParam.GetRetry(), remainTimes, channel.Id)
 			break
 		}
+		logger.LogDebug(c, "渠道重试继续: retry=%d, remaining=%d, channel_id=%d", retryParam.GetRetry(), remainTimes, channel.Id)
 	}
 
 	useChannel := c.GetStringSlice("use_channel")
@@ -349,6 +358,12 @@ func processChannelError(c *gin.Context, channelError types.ChannelError, err *t
 		if c.Request != nil && c.Request.URL != nil {
 			other["request_path"] = c.Request.URL.Path
 		}
+		requestBody, bodyErr := common.GetRequestBody(c)
+		if bodyErr == nil {
+			other["request_body"] = string(requestBody)
+		} else {
+			other["request_body_error"] = bodyErr.Error()
+		}
 		other["error_type"] = err.GetErrorType()
 		other["error_code"] = err.GetErrorCode()
 		other["status_code"] = err.StatusCode
@@ -454,8 +469,10 @@ func RelayTask(c *gin.Context) {
 		Retry:      common.GetPointer(0),
 	}
 	for ; shouldRetryTaskRelay(c, channelId, taskErr, retryTimes) && retryParam.GetRetry() < retryTimes; retryParam.IncreaseRetry() {
+		logger.LogDebug(c, "任务渠道重试开始: retry=%d/%d, current_channel=%d, model=%q, status=%d", retryParam.GetRetry(), retryTimes, channelId, relayInfo.OriginModelName, taskErr.StatusCode)
 		channel, newAPIError := getChannel(c, relayInfo, retryParam)
 		if newAPIError != nil {
+			logger.LogDebug(c, "任务渠道选择失败: retry=%d, err=%s", retryParam.GetRetry(), newAPIError.Error())
 			logger.LogError(c, fmt.Sprintf("CacheGetRandomSatisfiedChannel failed: %s", newAPIError.Error()))
 			taskErr = service.TaskErrorWrapperLocal(newAPIError.Err, "get_channel_failed", http.StatusInternalServerError)
 			break
@@ -464,11 +481,13 @@ func RelayTask(c *gin.Context) {
 		useChannel := c.GetStringSlice("use_channel")
 		useChannel = append(useChannel, fmt.Sprintf("%d", channelId))
 		c.Set("use_channel", useChannel)
+		logger.LogDebug(c, "任务渠道选择成功: retry=%d, channel_id=%d, channel_type=%d, channel_name=%q", retryParam.GetRetry(), channel.Id, channel.Type, channel.Name)
 		logger.LogInfo(c, fmt.Sprintf("using channel #%d to retry (remain times %d)", channel.Id, retryParam.GetRetry()))
 		//middleware.SetupContextForSelectedChannel(c, channel, originalModel)
 
 		requestBody, err := common.GetRequestBody(c)
 		if err != nil {
+			logger.LogDebug(c, "任务读取请求体失败: retry=%d, err=%s", retryParam.GetRetry(), err.Error())
 			if common.IsRequestBodyTooLargeError(err) || errors.Is(err, common.ErrRequestBodyTooLarge) {
 				taskErr = service.TaskErrorWrapperLocal(err, "read_request_body_failed", http.StatusRequestEntityTooLarge)
 			} else {
@@ -478,6 +497,11 @@ func RelayTask(c *gin.Context) {
 		}
 		c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
 		taskErr = taskRelayHandler(c, relayInfo)
+		if taskErr == nil {
+			logger.LogDebug(c, "任务渠道请求成功: retry=%d, channel_id=%d", retryParam.GetRetry(), channelId)
+		} else {
+			logger.LogDebug(c, "任务渠道请求失败: retry=%d, channel_id=%d, status=%d, code=%s, message=%s", retryParam.GetRetry(), channelId, taskErr.StatusCode, taskErr.Code, taskErr.Message)
+		}
 	}
 	useChannel := c.GetStringSlice("use_channel")
 	if len(useChannel) > 1 {
diff --git a/relay/channel/api_request.go b/relay/channel/api_request.go
index 1ff1e2392c5b..9480d5e4a6b2 100644
--- a/relay/channel/api_request.go
+++ b/relay/channel/api_request.go
@@ -38,10 +38,54 @@ func SetupApiRequestHeader(info *common.RelayInfo, c *gin.Context, req *http.Hea
 	}
 }
 
+func maskHeaderOverrideValue(value string, apiKey string) string {
+	if apiKey == "" || value == "" {
+		return value
+	}
+	return strings.ReplaceAll(value, apiKey, "***")
+}
+
+func maskHeaderOverrideForLog(headerOverride map[string]interface{}, apiKey string) map[string]interface{} {
+	if len(headerOverride) == 0 {
+		return nil
+	}
+	masked := make(map[string]interface{}, len(headerOverride))
+	for key, value := range headerOverride {
+		if str, ok := value.(string); ok {
+			masked[key] = maskHeaderOverrideValue(str, apiKey)
+		} else {
+			masked[key] = value
+		}
+	}
+	return masked
+}
+
+func maskHeaderOverrideForLogString(headerOverride map[string]string, apiKey string) map[string]string {
+	if len(headerOverride) == 0 {
+		return nil
+	}
+	masked := make(map[string]string, len(headerOverride))
+	for key, value := range headerOverride {
+		masked[key] = maskHeaderOverrideValue(value, apiKey)
+	}
+	return masked
+}
+
 // processHeaderOverride 处理请求头覆盖，支持变量替换
 // 支持的变量：{api_key}
-func processHeaderOverride(info *common.RelayInfo) (map[string]string, error) {
+func processHeaderOverride(c *gin.Context, info *common.RelayInfo) (map[string]string, error) {
+	channelId := 0
+	channelType := 0
+	if info != nil && info.ChannelMeta != nil {
+		channelId = info.ChannelId
+		channelType = info.ChannelType
+	}
 	headerOverride := make(map[string]string)
+	if len(info.HeadersOverride) == 0 {
+		logger.LogDebug(c, "请求头覆盖配置: channel_id=%d, channel_type=%d, headers=空", channelId, channelType)
+	} else {
+		logger.LogDebug(c, "请求头覆盖配置: channel_id=%d, channel_type=%d, headers=%s", channelId, channelType, common2.GetJsonString(maskHeaderOverrideForLog(info.HeadersOverride, info.ApiKey)))
+	}
 	for k, v := range info.HeadersOverride {
 		str, ok := v.(string)
 		if !ok {
@@ -55,6 +99,11 @@ func processHeaderOverride(info *common.RelayInfo) (map[string]string, error) {
 
 		headerOverride[k] = str
 	}
+	if len(headerOverride) == 0 {
+		logger.LogDebug(c, "请求头覆盖结果: channel_id=%d, channel_type=%d, headers=空", channelId, channelType)
+	} else {
+		logger.LogDebug(c, "请求头覆盖结果: channel_id=%d, channel_type=%d, headers=%s", channelId, channelType, common2.GetJsonString(maskHeaderOverrideForLogString(headerOverride, info.ApiKey)))
+	}
 	return headerOverride, nil
 }
 
@@ -71,7 +120,7 @@ func DoApiRequest(a Adaptor, c *gin.Context, info *common.RelayInfo, requestBody
 		return nil, fmt.Errorf("new request failed: %w", err)
 	}
 	headers := req.Header
-	headerOverride, err := processHeaderOverride(info)
+	headerOverride, err := processHeaderOverride(c, info)
 	if err != nil {
 		return nil, err
 	}
@@ -104,7 +153,7 @@ func DoFormRequest(a Adaptor, c *gin.Context, info *common.RelayInfo, requestBod
 	// set form data
 	req.Header.Set("Content-Type", c.Request.Header.Get("Content-Type"))
 	headers := req.Header
-	headerOverride, err := processHeaderOverride(info)
+	headerOverride, err := processHeaderOverride(c, info)
 	if err != nil {
 		return nil, err
 	}
@@ -128,7 +177,7 @@ func DoWssRequest(a Adaptor, c *gin.Context, info *common.RelayInfo, requestBody
 		return nil, fmt.Errorf("get request url failed: %w", err)
 	}
 	targetHeader := http.Header{}
-	headerOverride, err := processHeaderOverride(info)
+	headerOverride, err := processHeaderOverride(c, info)
 	if err != nil {
 		return nil, err
 	}
diff --git a/relay/helper/model_mapped.go b/relay/helper/model_mapped.go
index 821158faedf4..e3d51001a4d1 100644
--- a/relay/helper/model_mapped.go
+++ b/relay/helper/model_mapped.go
@@ -4,8 +4,11 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"strings"
 
+	basecommon "github.com/QuantumNous/new-api/common"
 	"github.com/QuantumNous/new-api/dto"
+	"github.com/QuantumNous/new-api/logger"
 	"github.com/QuantumNous/new-api/relay/common"
 	"github.com/gin-gonic/gin"
 )
@@ -13,6 +16,8 @@ import (
 func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request dto.Request) error {
 	// map model name
 	modelMapping := c.GetString("model_mapping")
+	logger.LogDebug(c, "模型映射检查: 原模型=%q, 映射配置=%s", info.OriginModelName, modelMapping)
+	chain := []string{info.OriginModelName}
 	if modelMapping != "" && modelMapping != "{}" {
 		modelMap := make(map[string]string)
 		err := json.Unmarshal([]byte(modelMapping), &modelMap)
@@ -20,6 +25,8 @@ func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request dto.Reque
 			return fmt.Errorf("unmarshal_model_mapping_failed")
 		}
 
+		logger.LogDebug(c, "模型映射解析: 原模型=%q, 映射表=%s", info.OriginModelName, basecommon.GetJsonString(modelMap))
+
 		// 支持链式模型重定向，最终使用链尾的模型
 		currentModel := info.OriginModelName
 		visitedModels := map[string]bool{
@@ -42,6 +49,7 @@ func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request dto.Reque
 				}
 				visitedModels[mappedModel] = true
 				currentModel = mappedModel
+				chain = append(chain, currentModel)
 				info.IsModelMapped = true
 			} else {
 				break
@@ -50,7 +58,14 @@ func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request dto.Reque
 		if info.IsModelMapped {
 			info.UpstreamModelName = currentModel
 		}
+	} else {
+		logger.LogDebug(c, "模型映射跳过: 原模型=%q, 未配置映射表", info.OriginModelName)
+	}
+	upstreamModel := info.UpstreamModelName
+	if upstreamModel == "" {
+		upstreamModel = info.OriginModelName
 	}
+	logger.LogDebug(c, "模型映射结果: 原模型=%q, 映射链路=%s, 上游模型=%q, 已映射=%t", info.OriginModelName, strings.Join(chain, "->"), upstreamModel, info.IsModelMapped)
 	if request != nil {
 		request.SetModelName(info.UpstreamModelName)
 	}