diff --git a/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/Configuration.java b/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/Configuration.java
index ee8fa5791..1f39bab98 100644
--- a/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/Configuration.java
+++ b/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/Configuration.java
@@ -58,9 +58,6 @@ public class Configuration {
 
     static {
         configProperties.put(CalciteConnectionProperty.CASE_SENSITIVE.camelName(), Boolean.TRUE.toString());
-        configProperties.put(CalciteConnectionProperty.UNQUOTED_CASING.camelName(), Casing.UNCHANGED.toString());
-        configProperties.put(CalciteConnectionProperty.QUOTED_CASING.camelName(), Casing.TO_LOWER.toString());
-
     }
 
     public static SqlParser.Config getParserConfig(EngineType engineType) {
@@ -77,10 +74,10 @@ public class Configuration {
                 .setIdentifierMaxLength(Integer.MAX_VALUE)
                 .setQuoting(Quoting.BACK_TICK)
                 .setQuoting(Quoting.SINGLE_QUOTE)
-                .setQuotedCasing(Casing.TO_UPPER)
-                .setUnquotedCasing(Casing.TO_UPPER)
                 .setConformance(sqlDialect.getConformance())
                 .setLex(Lex.BIG_QUERY);
+        parserConfig = parserConfig.setQuotedCasing(Casing.TO_LOWER);
+        parserConfig = parserConfig.setUnquotedCasing(Casing.TO_LOWER);
         return parserConfig.build();
     }