diff --git a/internal/domains/api/services/processors/pdfg/pdfg01gz_processor.go b/internal/domains/api/services/processors/pdfg/pdfg01gz_processor.go
index 8ca35d7..490b524 100644
--- a/internal/domains/api/services/processors/pdfg/pdfg01gz_processor.go
+++ b/internal/domains/api/services/processors/pdfg/pdfg01gz_processor.go
@@ -42,12 +42,14 @@ func ProcessPDFG01GZRequest(ctx context.Context, params []byte, deps *processors
 	// 从context获取config（如果存在）
 	var cacheTTL time.Duration = 24 * time.Hour
 	var cacheDir string
+	var apiDomain string
 	if cfg, ok := ctx.Value("config").(*config.Config); ok && cfg != nil {
 		cacheTTL = cfg.PDFGen.Cache.TTL
 		if cacheTTL == 0 {
 			cacheTTL = 24 * time.Hour
 		}
 		cacheDir = cfg.PDFGen.Cache.CacheDir
+		apiDomain = cfg.API.Domain
 	}
 
 	// 获取最大缓存大小
@@ -111,12 +113,15 @@ func ProcessPDFG01GZRequest(ctx context.Context, params []byte, deps *processors
 		time.Sleep(2 * time.Second)
 
 		// 生成下载链接（基于报告ID）
-		downloadURL := generateDownloadURL(reportID)
+		downloadURL := generateDownloadURL(apiDomain, reportID)
+		expiresAt := createdAt.Add(cacheTTL)
 		return json.Marshal(map[string]interface{}{
 			"download_url": downloadURL,
 			"report_id":    reportID,
 			"cached":       true,
 			"created_at":   createdAt.Format(time.RFC3339),
+			"expires_at":   expiresAt.Format(time.RFC3339),
+			"ttl_seconds":  int(cacheTTL.Seconds()),
 		})
 	}
 
@@ -186,7 +191,8 @@ func ProcessPDFG01GZRequest(ctx context.Context, params []byte, deps *processors
 	}
 
 	// 生成下载链接（基于报告ID）
-	downloadURL := generateDownloadURL(reportID)
+	downloadURL := generateDownloadURL(apiDomain, reportID)
+	expiresAt := time.Now().Add(cacheTTL)
 
 	zapLogger.Info("PDF生成成功",
 		zap.String("name", paramsDto.Name),
@@ -201,6 +207,8 @@ func ProcessPDFG01GZRequest(ctx context.Context, params []byte, deps *processors
 		"report_id":     reportID,
 		"report_number": reportNumber,
 		"cached":        false,
+		"expires_at":    expiresAt.Format(time.RFC3339),
+		"ttl_seconds":   int(cacheTTL.Seconds()),
 	})
 }
 
@@ -494,9 +502,13 @@ func generateReportNumber() string {
 }
 
 // generateDownloadURL 生成下载链接（基于报告ID/缓存键）
-func generateDownloadURL(reportID string) string {
-	// 这里应该生成实际的下载URL
-	// 暂时返回一个占位符，实际应该根据服务器配置生成
-	return fmt.Sprintf("/api/v1/pdfg/download?id=%s", reportID)
+// apiDomain: 外部可访问的API域名，如 api.tianyuanapi.com
+func generateDownloadURL(apiDomain, reportID string) string {
+	if apiDomain == "" {
+		// 兜底：保留相对路径，方便本地/测试环境使用
+		return fmt.Sprintf("/api/v1/pdfg/download?id=%s", reportID)
+	}
+	// 生成完整链接，例如：https://api.tianyuanapi.com/api/v1/pdfg/download?id=xxx
+	return fmt.Sprintf("https://%s/api/v1/pdfg/download?id=%s", apiDomain, reportID)
 }