diff --git a/src/main/java/com/spring/modules/lab/controller/LabController.java b/src/main/java/com/spring/modules/lab/controller/LabController.java
index cad14f18..433f3a01 100644
--- a/src/main/java/com/spring/modules/lab/controller/LabController.java
+++ b/src/main/java/com/spring/modules/lab/controller/LabController.java
@@ -32,6 +32,7 @@ import java.util.Map;
 public class LabController {
 
     private static final String REFERENCE_NO_TRANS_TYPE = "lab_no";
+    private static final String REFERENCE_NO_SITE = "41";
 
     @Autowired
     private LabService labService;
@@ -110,7 +111,8 @@ public class LabController {
         String newReferenceNo = originalReferenceNo;
 
         if (originalReferenceNo.startsWith("TEMP-")) {
-            newReferenceNo = transNoControlService.transNo(lab.getSite(), REFERENCE_NO_TRANS_TYPE);
+            // Lab单据号不区分业务site，统一使用site=41的编码规则
+            newReferenceNo = transNoControlService.transNo(REFERENCE_NO_SITE, REFERENCE_NO_TRANS_TYPE);
             if (StringUtils.isBlank(newReferenceNo)) {
                 return R.error("请维护编码生成规则(TransNoControl)！");
             }