diff --git a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MapResult.java b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MapResult.java
index a2583eb88..969a74eca 100644
--- a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MapResult.java
+++ b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MapResult.java
@@ -22,4 +22,9 @@ public abstract class MapResult implements Serializable {
         return this.getMapKey().equals(otherResult.getMapKey())
                 && this.similarity < otherResult.similarity;
     }
+
+    public Boolean lessOrEqualSimilar(MapResult otherResult) {
+        return this.getMapKey().equals(otherResult.getMapKey())
+                && this.similarity <= otherResult.similarity;
+    }
 }
diff --git a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MetaEmbeddingService.java b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MetaEmbeddingService.java
index e4f48597b..f8ee287c3 100644
--- a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MetaEmbeddingService.java
+++ b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/MetaEmbeddingService.java
@@ -75,6 +75,8 @@ public class MetaEmbeddingService {
             return dataSetIds.stream().map(dataSetId -> {
                 Retrieval newRetrieval = new Retrieval();
                 BeanUtils.copyProperties(retrieval, newRetrieval);
+                HashMap<String, Object> newMetadata = new HashMap<>(retrieval.getMetadata());
+                newRetrieval.setMetadata(newMetadata);
                 newRetrieval.getMetadata().putIfAbsent("dataSetId",
                         dataSetId + Constants.UNDERLINE);
                 return newRetrieval;
diff --git a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/mapper/BaseMatchStrategy.java b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/mapper/BaseMatchStrategy.java
index 57856ccd4..04b4d31d4 100644
--- a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/mapper/BaseMatchStrategy.java
+++ b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/mapper/BaseMatchStrategy.java
@@ -56,7 +56,8 @@ public abstract class BaseMatchStrategy<T extends MapResult> implements MatchStr
         for (T oneRoundResult : oneRoundResults) {
             if (existResults.contains(oneRoundResult)) {
                 boolean isDeleted = existResults.removeIf(existResult -> {
-                    boolean delete = existResult.lessSimilar(oneRoundResult);
+//                    boolean delete = existResult.lessSimilar(oneRoundResult);
+                    boolean delete = existResult.lessOrEqualSimilar(oneRoundResult);
                     if (delete) {
                         log.debug("deleted existResult:{}", existResult);
                     }