diff --git a/headless/server/src/main/java/com/tencent/supersonic/headless/server/service/impl/DictWordService.java b/headless/server/src/main/java/com/tencent/supersonic/headless/server/service/impl/DictWordService.java
index 86f1c541e..89362ac99 100644
--- a/headless/server/src/main/java/com/tencent/supersonic/headless/server/service/impl/DictWordService.java
+++ b/headless/server/src/main/java/com/tencent/supersonic/headless/server/service/impl/DictWordService.java
@@ -6,6 +6,7 @@ import com.tencent.supersonic.headless.api.pojo.SchemaElementType;
 import com.tencent.supersonic.headless.api.pojo.SemanticSchema;
 import com.tencent.supersonic.headless.chat.knowledge.DictWord;
 import com.tencent.supersonic.headless.chat.knowledge.KnowledgeBaseService;
+import com.tencent.supersonic.headless.chat.knowledge.SearchService;
 import com.tencent.supersonic.headless.chat.knowledge.builder.WordBuilderFactory;
 import com.tencent.supersonic.headless.server.service.SchemaService;
 import lombok.extern.slf4j.Slf4j;
@@ -43,6 +44,7 @@ public class DictWordService {
             return;
         }
         setPreDictWords(dictWords);
+        SearchService.clear();
         knowledgeBaseService.updateOnlineKnowledge(getAllDictWords());
         long duration = System.currentTimeMillis() - startTime;
         log.info("Dictionary has been regularly reloaded in {} milliseconds", duration);