diff --git a/plugins/services/postgresql.go b/plugins/services/postgresql.go
index a904188..f4353f3 100644
--- a/plugins/services/postgresql.go
+++ b/plugins/services/postgresql.go
@@ -114,17 +114,28 @@ func (p *PostgreSQLPlugin) identifyService(ctx context.Context, info *common.Hos
 
 	err = db.PingContext(pingCtx)
 	
+	// 改进识别逻辑：任何PostgreSQL相关的响应都认为是有效服务
 	var banner string
-	if err != nil && strings.Contains(strings.ToLower(err.Error()), "postgres") {
-		banner = "PostgreSQL"
-	} else if err == nil {
-		banner = "PostgreSQL"
-	} else {
-		return &ScanResult{
-			Success: false,
-			Service: "postgresql",
-			Error:   fmt.Errorf("无法识别为PostgreSQL服务"),
+	if err != nil {
+		errMsg := strings.ToLower(err.Error())
+		// PostgreSQL常见错误关键词
+		if strings.Contains(errMsg, "postgres") || 
+		   strings.Contains(errMsg, "authentication") || 
+		   strings.Contains(errMsg, "database") ||
+		   strings.Contains(errMsg, "password") ||
+		   strings.Contains(errMsg, "role") ||
+		   strings.Contains(errMsg, "user") ||
+		   strings.Contains(errMsg, "pq:") {
+			banner = "PostgreSQL"
+		} else {
+			return &ScanResult{
+				Success: false,
+				Service: "postgresql", 
+				Error:   fmt.Errorf("无法识别为PostgreSQL服务: %s", err.Error()),
+			}
 		}
+	} else {
+		banner = "PostgreSQL (连接成功)"
 	}
 
 	common.LogSuccess(fmt.Sprintf("PostgreSQL %s %s", target, banner))