diff --git a/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/AmniocentesisFacade.java b/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/AmniocentesisFacade.java
index 3a4084e..f23f5cb 100644
--- a/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/AmniocentesisFacade.java
+++ b/platform-operate-api/src/main/java/com/lyms/platform/operate/web/facade/AmniocentesisFacade.java
@@ -319,12 +319,12 @@ public class AmniocentesisFacade {
             @Override
             public int compare(Map<String,Object> o1, Map<String,Object> o2) {
                 String weight1 = o1.get("weight").toString();
-                String weight2 = o1.get("weight").toString();
+                String weight2 = o2.get("weight").toString();
                 if (StringUtils.isNotEmpty(weight1) && StringUtils.isNotEmpty(weight2))
                 {
                     Double d1 = Double.parseDouble(weight1);
                     Double d2 = Double.parseDouble(weight2);
-                    return (int)(d1 - d2);
+                    return (int)(d2 - d1);
                 }
                 return  0;
             }