diff --git a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/KnowledgeBaseService.java b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/KnowledgeBaseService.java
index de3cc9423..adac95426 100644
--- a/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/KnowledgeBaseService.java
+++ b/headless/chat/src/main/java/com/tencent/supersonic/headless/chat/knowledge/KnowledgeBaseService.java
@@ -52,7 +52,7 @@ public class KnowledgeBaseService {
         updateOnlineKnowledge(natures);
     }
 
-    public void updateOnlineKnowledge(List<DictWord> natures) {
+    private void updateOnlineKnowledge(List<DictWord> natures) {
         try {
             updateSemanticKnowledge(natures);
         } catch (Exception e) {
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 89362ac99..309422b3e 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
@@ -6,7 +6,6 @@ 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;
@@ -44,8 +43,7 @@ public class DictWordService {
             return;
         }
         setPreDictWords(dictWords);
-        SearchService.clear();
-        knowledgeBaseService.updateOnlineKnowledge(getAllDictWords());
+        knowledgeBaseService.reloadAllData(getAllDictWords());
         long duration = System.currentTimeMillis() - startTime;
         log.info("Dictionary has been regularly reloaded in {} milliseconds", duration);
     }
diff --git a/headless/server/src/main/java/com/tencent/supersonic/headless/server/utils/QueryStructUtils.java b/headless/server/src/main/java/com/tencent/supersonic/headless/server/utils/QueryStructUtils.java
index beae71c57..1ed65393e 100644
--- a/headless/server/src/main/java/com/tencent/supersonic/headless/server/utils/QueryStructUtils.java
+++ b/headless/server/src/main/java/com/tencent/supersonic/headless/server/utils/QueryStructUtils.java
@@ -59,7 +59,6 @@ public class QueryStructUtils {
     private final DateModeUtils dateModeUtils;
     private final SqlFilterUtils sqlFilterUtils;
     private final SchemaService schemaService;
-    private String variablePrefix = "'${";
 
     public QueryStructUtils(
             DateModeUtils dateModeUtils,