diff --git a/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java b/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java
index 8d0260d237..3a6ca2b3e3 100644
--- a/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java
+++ b/src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java
@@ -37,6 +37,7 @@ import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBetweenExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
+import com.alibaba.druid.sql.ast.expr.SQLCaseExpr;
 import com.alibaba.druid.sql.ast.expr.SQLCaseExpr.Item;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
@@ -1022,6 +1023,17 @@ public class WallVisitorUtils {
             return SQLEvalVisitorUtils.eval(dbType, x, Collections.emptyList(), false);
         }
 
+        if (x instanceof SQLCaseExpr) {
+            SQLCaseExpr caseExpr = (SQLCaseExpr) x;
+            if (caseExpr.getItems().size() > 0) {
+                SQLCaseExpr.Item item = caseExpr.getItems().get(0);
+                Object conditionVal = getValue(visitor, item.getConditionExpr());
+                if (conditionVal instanceof Boolean) {
+                    addViolation(visitor, ErrorCode.CONST_CASE_CONDITION, "const case condition", caseExpr);
+                }
+            }
+        }
+
         return null;
     }
 
diff --git a/src/main/java/com/alibaba/druid/wall/violation/ErrorCode.java b/src/main/java/com/alibaba/druid/wall/violation/ErrorCode.java
index bbdd51a9d2..62a9b47ca7 100644
--- a/src/main/java/com/alibaba/druid/wall/violation/ErrorCode.java
+++ b/src/main/java/com/alibaba/druid/wall/violation/ErrorCode.java
@@ -63,6 +63,7 @@ public interface ErrorCode {
     public final static int EmptyQueryHasCondition        = 2106;
     public final static int DoubleConstCondition          = 2107;
     public final static int SameConstLike                 = 2108;
+    public final static int CONST_CASE_CONDITION          = 2109;
 
     public final static int NOT_PARAMETERIZED             = 2200;
     public final static int MULTI_TENANT                  = 2201;