diff --git a/src/main/java/com/glxp/api/controller/purchase/PurOrderController.java b/src/main/java/com/glxp/api/controller/purchase/PurOrderController.java
index 49dc003fa..ef33d7d64 100644
--- a/src/main/java/com/glxp/api/controller/purchase/PurOrderController.java
+++ b/src/main/java/com/glxp/api/controller/purchase/PurOrderController.java
@@ -187,7 +187,15 @@ public class PurOrderController {
                 }
                 purOrderService.deleteById(id);
                 purOrderDetailService.deleteByOrderId(id + "");
-            } else {
+            }else if (purOrderDetailMap.size() == 1) {
+                //判断要是往来单位是空的就从详情里面取
+                if(StrUtil.isBlank(purOrderEntity.getSupId())){
+                    for (String key : purOrderDetailMap.keySet()) {
+                        purOrderEntity.setSupId(key);
+                    }
+                }
+                purOrderService.update(purOrderEntity);
+            }else{
                 purOrderService.update(purOrderEntity);
             }
         }