diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
index b8d3471ab5..7709e7382a 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
@@ -66,7 +66,9 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
     }
 
     public boolean visit(MySqlBooleanExpr x) {
-        return true;
+        print(x.getValue() ? "true" : "false");
+        
+        return false;
     }
 
     public void endVisit(MySqlBooleanExpr x) {
diff --git a/src/test/java/com/alibaba/druid/sql/mysql/bvt/BooleanValuesTest.java b/src/test/java/com/alibaba/druid/sql/mysql/bvt/BooleanValuesTest.java
index b429b404f1..55323ecd1b 100644
--- a/src/test/java/com/alibaba/druid/sql/mysql/bvt/BooleanValuesTest.java
+++ b/src/test/java/com/alibaba/druid/sql/mysql/bvt/BooleanValuesTest.java
@@ -35,7 +35,7 @@ public class BooleanValuesTest extends TestCase {
 
         String text = output(stmtList);
 
-        Assert.assertEquals("SELECT TRUE, true, FALSE, false;", text);
+        Assert.assertEquals("SELECT true, true, false, false;", text);
     }
 
     private String output(List<SQLStatement> stmtList) {
diff --git a/src/test/java/com/alibaba/druid/sql/mysql/bvt/ComparisonFunctionsAndOperatorsTest.java b/src/test/java/com/alibaba/druid/sql/mysql/bvt/ComparisonFunctionsAndOperatorsTest.java
index 74fc62c02b..4cee3222b6 100644
--- a/src/test/java/com/alibaba/druid/sql/mysql/bvt/ComparisonFunctionsAndOperatorsTest.java
+++ b/src/test/java/com/alibaba/druid/sql/mysql/bvt/ComparisonFunctionsAndOperatorsTest.java
@@ -134,7 +134,7 @@ public class ComparisonFunctionsAndOperatorsTest extends TestCase {
 
         String text = output(stmtList);
 
-        Assert.assertEquals("SELECT 1 IS TRUE, 0 IS FALSE, NULL IS UNKNOWN;", text);
+        Assert.assertEquals("SELECT 1 IS true, 0 IS false, NULL IS UNKNOWN;", text);
     }
 
     public void test_10() throws Exception {
diff --git a/src/test/java/com/alibaba/druid/sql/mysql/bvt/LogicalOperatorsTest.java b/src/test/java/com/alibaba/druid/sql/mysql/bvt/LogicalOperatorsTest.java
index 9b9459f700..6b314621c6 100644
--- a/src/test/java/com/alibaba/druid/sql/mysql/bvt/LogicalOperatorsTest.java
+++ b/src/test/java/com/alibaba/druid/sql/mysql/bvt/LogicalOperatorsTest.java
@@ -35,7 +35,7 @@ public class LogicalOperatorsTest extends TestCase {
 
         String text = output(stmtList);
 
-        Assert.assertEquals("SELECT 10 IS TRUE;", text);
+        Assert.assertEquals("SELECT 10 IS true;", text);
     }
 
     public void test_1() throws Exception {
@@ -46,7 +46,7 @@ public class LogicalOperatorsTest extends TestCase {
 
         String text = output(stmtList);
 
-        Assert.assertEquals("SELECT -10 IS TRUE;", text);
+        Assert.assertEquals("SELECT -10 IS true;", text);
     }
 
     public void test_2() throws Exception {