diff --git a/internal/domains/api/services/processors/qygl/yycxa01a_processor.go b/internal/domains/api/services/processors/qygl/qygl101A_processor.go
similarity index 90%
rename from internal/domains/api/services/processors/qygl/yycxa01a_processor.go
rename to internal/domains/api/services/processors/qygl/qygl101A_processor.go
index 1ed4892..8dbf839 100644
--- a/internal/domains/api/services/processors/qygl/yycxa01a_processor.go
+++ b/internal/domains/api/services/processors/qygl/qygl101A_processor.go
@@ -31,8 +31,6 @@ func ProcessQYGL101ARequest(ctx context.Context, params []byte, deps *processors
 		return nil, errors.Join(processors.ErrSystem, errors.New("北京正信服务未初始化"))
 	}
 
-	// apiPath 入参；CallAPI 内拼接为 /openapi/v1/a01/person-company-relations
-	// 上游 idCard 要求 32 位 MD5（兼容 64 位 SHA-256），平台侧收明文后在此做摘要
 	result, err := deps.YuyuechaService.CallAPI(ctx, "a01/person-company-relations", map[string]interface{}{
 		"name":   paramsDto.Name,
 		"idCard": yuyuecha.HashIDCard(paramsDto.IDCard),
diff --git a/internal/infrastructure/external/yuyuecha/crypto.go b/internal/infrastructure/external/yuyuecha/crypto.go
index 456e246..44a792a 100644
--- a/internal/infrastructure/external/yuyuecha/crypto.go
+++ b/internal/infrastructure/external/yuyuecha/crypto.go
@@ -37,15 +37,20 @@ func isHexDigest(s string, length int) bool {
 	return true
 }
 
-// SignHeaders 按 OpenAPI 规范生成签名请求头
+// SignHeaders 按 OpenAPI 规范生成签名请求头。
+// nonce 传入本地请求流水 ID（与日志 request_id 一致），便于上下游按同一 ID 排查；为空时回退随机生成。
 // canonical:
 //
-//	clientId={id}\ntimestamp={ms}\nnonce={hex}\nmethod={METHOD}\npath={path}\nbodySha256={sha256}
-func SignHeaders(clientID, clientSecret, method, path string, body []byte) (map[string]string, error) {
+//	clientId={id}\ntimestamp={ms}\nnonce={nonce}\nmethod={METHOD}\npath={path}\nbodySha256={sha256}
+func SignHeaders(clientID, clientSecret, method, path string, body []byte, nonce string) (map[string]string, error) {
 	timestamp := strconv.FormatInt(time.Now().UnixMilli(), 10)
-	nonce, err := randomNonce(16)
-	if err != nil {
-		return nil, fmt.Errorf("生成 nonce 失败: %w", err)
+	nonce = strings.TrimSpace(nonce)
+	if nonce == "" {
+		var err error
+		nonce, err = randomNonce(16)
+		if err != nil {
+			return nil, fmt.Errorf("生成 nonce 失败: %w", err)
+		}
 	}
 
 	sum := sha256.Sum256(body)
diff --git a/internal/infrastructure/external/yuyuecha/curl_helper.go b/internal/infrastructure/external/yuyuecha/curl_helper.go
index 8c6b86f..c6b2a85 100644
--- a/internal/infrastructure/external/yuyuecha/curl_helper.go
+++ b/internal/infrastructure/external/yuyuecha/curl_helper.go
@@ -1,6 +1,18 @@
 package yuyuecha
 
-import "strings"
+import (
+	"sort"
+	"strings"
+)
+
+// 签名头固定顺序，便于阅读与对比
+var preferredHeaderOrder = []string{
+	"Content-Type",
+	"clientId",
+	"timestamp",
+	"nonce",
+	"signature",
+}
 
 // generateCurlCommand 生成可复现的 curl 命令，便于数据源排查
 func generateCurlCommand(method, url string, headers map[string]string, body string) string {
@@ -11,11 +23,11 @@ func generateCurlCommand(method, url string, headers map[string]string, body str
 	cmd.WriteString(url)
 	cmd.WriteString("'")
 
-	for key, value := range headers {
+	for _, key := range orderedHeaderKeys(headers) {
 		cmd.WriteString(" \\\n  -H '")
 		cmd.WriteString(escapeShellSingleQuote(key))
 		cmd.WriteString(": ")
-		cmd.WriteString(escapeShellSingleQuote(value))
+		cmd.WriteString(escapeShellSingleQuote(headers[key]))
 		cmd.WriteString("'")
 	}
 
@@ -28,6 +40,25 @@ func generateCurlCommand(method, url string, headers map[string]string, body str
 	return cmd.String()
 }
 
+func orderedHeaderKeys(headers map[string]string) []string {
+	seen := make(map[string]struct{}, len(headers))
+	keys := make([]string, 0, len(headers))
+	for _, key := range preferredHeaderOrder {
+		if _, ok := headers[key]; ok {
+			keys = append(keys, key)
+			seen[key] = struct{}{}
+		}
+	}
+	rest := make([]string, 0, len(headers))
+	for key := range headers {
+		if _, ok := seen[key]; !ok {
+			rest = append(rest, key)
+		}
+	}
+	sort.Strings(rest)
+	return append(keys, rest...)
+}
+
 func escapeShellSingleQuote(s string) string {
 	return strings.ReplaceAll(s, "'", `'\''`)
 }
diff --git a/internal/infrastructure/external/yuyuecha/debug_exchange.go b/internal/infrastructure/external/yuyuecha/debug_exchange.go
new file mode 100644
index 0000000..5a5f35f
--- /dev/null
+++ b/internal/infrastructure/external/yuyuecha/debug_exchange.go
@@ -0,0 +1,107 @@
+package yuyuecha
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+)
+
+const debugExchangeFileName = "dev_curl.log"
+
+var debugExchangeMu sync.Mutex
+
+type debugExchangeRecord struct {
+	RequestID     string
+	TransactionID string
+	API           string
+	Status        int
+	Duration      time.Duration
+	Curl          string
+	ResponseBody  []byte
+	Error         string
+}
+
+// writeDebugExchange 开发环境写入单一排查文件：一次调用一条记录，含 curl + response
+func writeDebugExchange(logDir string, rec debugExchangeRecord) {
+	if strings.TrimSpace(logDir) == "" || strings.TrimSpace(rec.Curl) == "" {
+		return
+	}
+
+	var b strings.Builder
+	b.WriteString(strings.Repeat("=", 72))
+	b.WriteByte('\n')
+	b.WriteString("time: ")
+	b.WriteString(time.Now().Format("2006-01-02 15:04:05.000"))
+	b.WriteByte('\n')
+	b.WriteString("request_id: ")
+	b.WriteString(rec.RequestID)
+	b.WriteByte('\n')
+	// 与上游签名头 nonce 一致，对外排查只提供 request_id 即可
+	b.WriteString("nonce: ")
+	b.WriteString(rec.RequestID)
+	b.WriteByte('\n')
+	if rec.TransactionID != "" {
+		b.WriteString("transaction_id: ")
+		b.WriteString(rec.TransactionID)
+		b.WriteByte('\n')
+	}
+	b.WriteString("api: ")
+	b.WriteString(rec.API)
+	b.WriteByte('\n')
+	if rec.Status > 0 {
+		b.WriteString(fmt.Sprintf("status: %d\n", rec.Status))
+	}
+	b.WriteString(fmt.Sprintf("duration: %s\n", rec.Duration.Round(time.Millisecond)))
+	if rec.Error != "" {
+		b.WriteString("error: ")
+		b.WriteString(rec.Error)
+		b.WriteByte('\n')
+	}
+
+	b.WriteByte('\n')
+	b.WriteString("[curl]\n")
+	b.WriteString(rec.Curl)
+	b.WriteByte('\n')
+
+	b.WriteByte('\n')
+	b.WriteString("[response]\n")
+	if len(rec.ResponseBody) == 0 {
+		b.WriteString("(empty)\n")
+	} else {
+		b.WriteString(prettyJSONForLog(rec.ResponseBody))
+		b.WriteByte('\n')
+	}
+	b.WriteString(strings.Repeat("=", 72))
+	b.WriteString("\n\n")
+
+	debugExchangeMu.Lock()
+	defer debugExchangeMu.Unlock()
+
+	if err := os.MkdirAll(logDir, 0755); err != nil {
+		return
+	}
+	path := filepath.Join(logDir, debugExchangeFileName)
+	f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+	_, _ = f.WriteString(b.String())
+}
+
+func prettyJSONForLog(raw []byte) string {
+	trimmed := bytes.TrimSpace(raw)
+	if len(trimmed) == 0 {
+		return "(empty)"
+	}
+	var buf bytes.Buffer
+	if err := json.Indent(&buf, trimmed, "", "  "); err != nil {
+		return string(raw)
+	}
+	return buf.String()
+}
diff --git a/internal/infrastructure/external/yuyuecha/yuyuecha_factory.go b/internal/infrastructure/external/yuyuecha/yuyuecha_factory.go
index 001dc93..2ef3ad6 100644
--- a/internal/infrastructure/external/yuyuecha/yuyuecha_factory.go
+++ b/internal/infrastructure/external/yuyuecha/yuyuecha_factory.go
@@ -1,6 +1,8 @@
 package yuyuecha
 
 import (
+	"path/filepath"
+
 	"tyapi-server/internal/config"
 	"tyapi-server/internal/shared/external_logger"
 )
@@ -38,12 +40,18 @@ func NewYuyuechaServiceWithConfig(cfg *config.Config) (*YuyuechaService, error)
 		timeout = cfg.Yuyuecha.Timeout
 	}
 
+	logDir := cfg.Yuyuecha.Logging.LogDir
+	if logDir == "" {
+		logDir = "logs/external_services"
+	}
+
 	serviceCfg := ServiceConfig{
 		BaseURL:      cfg.Yuyuecha.BaseURL,
 		ClientID:     cfg.Yuyuecha.ClientID,
 		ClientSecret: cfg.Yuyuecha.ClientSecret,
 		Timeout:      timeout,
 		Debug:        cfg.App.IsDevelopment(),
+		DebugLogDir:  filepath.Join(logDir, "yuyuecha"),
 	}
 
 	return NewYuyuechaService(serviceCfg, logger), nil
diff --git a/internal/infrastructure/external/yuyuecha/yuyuecha_service.go b/internal/infrastructure/external/yuyuecha/yuyuecha_service.go
index 2f749fb..4ddf5e3 100644
--- a/internal/infrastructure/external/yuyuecha/yuyuecha_service.go
+++ b/internal/infrastructure/external/yuyuecha/yuyuecha_service.go
@@ -14,8 +14,6 @@ import (
 	"time"
 
 	"tyapi-server/internal/shared/external_logger"
-
-	"go.uber.org/zap"
 )
 
 const (
@@ -39,8 +37,10 @@ type ServiceConfig struct {
 	ClientID     string
 	ClientSecret string
 	Timeout      time.Duration
-	// Debug 开发环境开启时输出可复现 curl 与完整响应体，便于数据源排查
+	// Debug 开发环境开启时写入单一排查文件（curl + response），不重复打 request/response 日志
 	Debug bool
+	// DebugLogDir 排查日志目录，文件名为 dev_curl.log
+	DebugLogDir string
 }
 
 // YuyuechaService 愉悦查 OpenAPI 客户端
@@ -127,11 +127,13 @@ func (s *YuyuechaService) doRequest(ctx context.Context, method, path string, bo
 	baseURL := strings.TrimSuffix(s.config.BaseURL, "/")
 	reqURL := baseURL + path
 
-	if s.logger != nil {
+	// dev 排查走单一文件，避免 request/response/info 重复打点
+	if !s.config.Debug && s.logger != nil {
 		s.logger.LogRequest(requestID, transactionID, path, reqURL)
 	}
 
-	signHeaders, err := SignHeaders(s.config.ClientID, s.config.ClientSecret, method, path, bodyBytes)
+	// nonce 与本地 request_id 保持一致，后续仅凭 request_id 即可对接上游排查
+	signHeaders, err := SignHeaders(s.config.ClientID, s.config.ClientSecret, method, path, bodyBytes, requestID)
 	if err != nil {
 		err = errors.Join(ErrSystem, err)
 		s.logError(requestID, transactionID, path, err, map[string]interface{}{"request_params": logParams})
@@ -172,11 +174,8 @@ func (s *YuyuechaService) doRequest(ctx context.Context, method, path string, bo
 	resp, err := client.Do(req)
 	if err != nil {
 		err = wrapHTTPError(err)
-		errParams := map[string]interface{}{"request_params": logParams}
-		if curlCmd != "" {
-			errParams["curl"] = curlCmd
-		}
-		s.logError(requestID, transactionID, path, err, errParams)
+		s.logDebugExchange(requestID, transactionID, path, curlCmd, 0, time.Since(startTime), nil, err.Error())
+		s.logError(requestID, transactionID, path, err, map[string]interface{}{"request_params": logParams})
 		return nil, err
 	}
 	defer resp.Body.Close()
@@ -185,45 +184,34 @@ func (s *YuyuechaService) doRequest(ctx context.Context, method, path string, bo
 	raw, err := io.ReadAll(resp.Body)
 	if err != nil {
 		err = errors.Join(ErrSystem, err)
-		errParams := map[string]interface{}{"request_params": logParams}
-		if curlCmd != "" {
-			errParams["curl"] = curlCmd
-		}
-		s.logError(requestID, transactionID, path, err, errParams)
+		s.logDebugExchange(requestID, transactionID, path, curlCmd, resp.StatusCode, duration, nil, err.Error())
+		s.logError(requestID, transactionID, path, err, map[string]interface{}{"request_params": logParams})
 		return nil, err
 	}
 
-	s.logDebugCurlAndResponse(requestID, transactionID, path, curlCmd, resp.StatusCode, duration, raw)
+	s.logDebugExchange(requestID, transactionID, path, curlCmd, resp.StatusCode, duration, raw, "")
 
 	if resp.StatusCode != http.StatusOK {
 		mapped := mapHTTPStatusError(resp.StatusCode, raw)
-		errParams := map[string]interface{}{
+		s.logError(requestID, transactionID, path, mapped, map[string]interface{}{
 			"request_params": logParams,
 			"response_body":  truncateForLog(string(raw), maxLogResponseBodyLen),
 			"http_status":    resp.StatusCode,
-		}
-		if curlCmd != "" {
-			errParams["curl"] = curlCmd
-		}
-		s.logError(requestID, transactionID, path, mapped, errParams)
+		})
 		return nil, mapped
 	}
 
-	if s.logger != nil {
+	if !s.config.Debug && s.logger != nil {
 		s.logger.LogResponse(requestID, transactionID, path, resp.StatusCode, duration)
 	}
 
 	var outer APIResponse
 	if err := json.Unmarshal(raw, &outer); err != nil {
 		parseErr := errors.Join(ErrSystem, fmt.Errorf("响应解析失败: %w", err))
-		errParams := map[string]interface{}{
+		s.logError(requestID, transactionID, path, parseErr, map[string]interface{}{
 			"request_params": logParams,
 			"response_body":  truncateForLog(string(raw), maxLogResponseBodyLen),
-		}
-		if curlCmd != "" {
-			errParams["curl"] = curlCmd
-		}
-		s.logError(requestID, transactionID, path, parseErr, errParams)
+		})
 		return nil, parseErr
 	}
 
@@ -235,14 +223,10 @@ func (s *YuyuechaService) doRequest(ctx context.Context, method, path string, bo
 			msg = *outer.ErrCode
 		}
 		mapped := errors.Join(ErrDatasource, errors.New(msg))
-		errParams := map[string]interface{}{
+		s.logError(requestID, transactionID, path, mapped, map[string]interface{}{
 			"request_params": logParams,
 			"response_body":  truncateForLog(string(raw), maxLogResponseBodyLen),
-		}
-		if curlCmd != "" {
-			errParams["curl"] = curlCmd
-		}
-		s.logError(requestID, transactionID, path, mapped, errParams)
+		})
 		return nil, mapped
 	}
 
@@ -329,18 +313,18 @@ func (s *YuyuechaService) logError(requestID, transactionID, apiCode string, err
 	}
 }
 
-// logDebugCurlAndResponse 仅在 Debug（开发环境）输出完整 curl 与响应体
-func (s *YuyuechaService) logDebugCurlAndResponse(requestID, transactionID, apiCode, curlCmd string, statusCode int, duration time.Duration, raw []byte) {
-	if !s.config.Debug || s.logger == nil || curlCmd == "" {
+func (s *YuyuechaService) logDebugExchange(requestID, transactionID, apiCode, curlCmd string, statusCode int, duration time.Duration, raw []byte, errMsg string) {
+	if !s.config.Debug {
 		return
 	}
-	s.logger.LogInfo("愉悦查请求响应(dev)",
-		zap.String("request_id", requestID),
-		zap.String("transaction_id", transactionID),
-		zap.String("api_code", apiCode),
-		zap.Int("http_status", statusCode),
-		zap.Duration("duration", duration),
-		zap.String("curl", curlCmd),
-		zap.String("response_body", string(raw)),
-	)
+	writeDebugExchange(s.config.DebugLogDir, debugExchangeRecord{
+		RequestID:     requestID,
+		TransactionID: transactionID,
+		API:           apiCode,
+		Status:        statusCode,
+		Duration:      duration,
+		Curl:          curlCmd,
+		ResponseBody:  raw,
+		Error:         errMsg,
+	})
 }
diff --git a/internal/infrastructure/external/yuyuecha/yuyuecha_service_test.go b/internal/infrastructure/external/yuyuecha/yuyuecha_service_test.go
index 9731d05..1a4966a 100644
--- a/internal/infrastructure/external/yuyuecha/yuyuecha_service_test.go
+++ b/internal/infrastructure/external/yuyuecha/yuyuecha_service_test.go
@@ -38,6 +38,31 @@ func TestHashIDCard(t *testing.T) {
 	}
 }
 
+func TestGenerateCurlCommandHeaderOrder(t *testing.T) {
+	cmd := generateCurlCommand("POST", "https://example.com/openapi/v1/a01/x", map[string]string{
+		"signature":    "sig",
+		"Content-Type": "application/json",
+		"nonce":        "n",
+		"clientId":     "cid",
+		"timestamp":    "1",
+	}, `{"name":"a"}`)
+	wantOrder := []string{
+		"-H 'Content-Type: application/json'",
+		"-H 'clientId: cid'",
+		"-H 'timestamp: 1'",
+		"-H 'nonce: n'",
+		"-H 'signature: sig'",
+	}
+	pos := 0
+	for _, part := range wantOrder {
+		idx := strings.Index(cmd[pos:], part)
+		if idx < 0 {
+			t.Fatalf("missing ordered header %q in:\n%s", part, cmd)
+		}
+		pos += idx + len(part)
+	}
+}
+
 func sandboxService() *YuyuechaService {
 	return NewYuyuechaService(ServiceConfig{
 		BaseURL:      "https://sandbox-api.yuyuecha.com",