diff --git a/src/main/java/com/alibaba/druid/filter/wall/MySqlWallVisitor.java b/src/main/java/com/alibaba/druid/filter/wall/spi/MySqlWallVisitor.java
similarity index 87%
rename from src/main/java/com/alibaba/druid/filter/wall/MySqlWallVisitor.java
rename to src/main/java/com/alibaba/druid/filter/wall/spi/MySqlWallVisitor.java
index bba0bfa773..eb6acaa223 100644
--- a/src/main/java/com/alibaba/druid/filter/wall/MySqlWallVisitor.java
+++ b/src/main/java/com/alibaba/druid/filter/wall/spi/MySqlWallVisitor.java
@@ -1,8 +1,9 @@
-package com.alibaba.druid.filter.wall;
+package com.alibaba.druid.filter.wall.spi;
 
 import java.util.ArrayList;
 import java.util.List;
 
+import com.alibaba.druid.filter.wall.Violation;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlExecuteStatement;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitorAdapter;
 
diff --git a/src/main/java/com/alibaba/druid/filter/wall/OracleWallVisitor.java b/src/main/java/com/alibaba/druid/filter/wall/spi/OracleWallVisitor.java
similarity index 83%
rename from src/main/java/com/alibaba/druid/filter/wall/OracleWallVisitor.java
rename to src/main/java/com/alibaba/druid/filter/wall/spi/OracleWallVisitor.java
index ed09a68615..65abd7e9c8 100644
--- a/src/main/java/com/alibaba/druid/filter/wall/OracleWallVisitor.java
+++ b/src/main/java/com/alibaba/druid/filter/wall/spi/OracleWallVisitor.java
@@ -1,8 +1,10 @@
-package com.alibaba.druid.filter.wall;
+package com.alibaba.druid.filter.wall.spi;
 
 import java.util.ArrayList;
 import java.util.List;
 
+import com.alibaba.druid.filter.wall.Violation;
+import com.alibaba.druid.filter.wall.WallVisitor;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVIsitorAdapter;
 
diff --git a/src/main/java/com/alibaba/druid/filter/wall/WallVisitorUtils.java b/src/main/java/com/alibaba/druid/filter/wall/spi/WallVisitorUtils.java
similarity index 88%
rename from src/main/java/com/alibaba/druid/filter/wall/WallVisitorUtils.java
rename to src/main/java/com/alibaba/druid/filter/wall/spi/WallVisitorUtils.java
index 66cac99fc6..ec71e13054 100644
--- a/src/main/java/com/alibaba/druid/filter/wall/WallVisitorUtils.java
+++ b/src/main/java/com/alibaba/druid/filter/wall/spi/WallVisitorUtils.java
@@ -1,5 +1,7 @@
-package com.alibaba.druid.filter.wall;
+package com.alibaba.druid.filter.wall.spi;
 
+import com.alibaba.druid.filter.wall.IllegalConditionViolation;
+import com.alibaba.druid.filter.wall.WallVisitor;
 import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;