diff --git a/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest83.java b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest83.java
new file mode 100644
index 0000000000..d2b11581e5
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/filter/wall/MySqlWallTest83.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallProvider;
+import com.alibaba.druid.wall.spi.MySqlWallProvider;
+
+/**
+ * SQLServerWallTest
+ * 
+ * @author RaymondXiu
+ * @version 1.0, 2012-3-18
+ * @see
+ */
+public class MySqlWallTest83 extends TestCase {
+
+    public void test_false() throws Exception {
+        WallProvider provider = new MySqlWallProvider();
+        
+        Assert.assertTrue(provider.checkValid(//
+        "alter table rms.rms_Person_Event drop foreign key FKA382487726D72F65"));
+
+        Assert.assertEquals(1, provider.getTableStats().size());
+    }
+
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest17.java b/src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest17.java
new file mode 100644
index 0000000000..78b0514e1d
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest17.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.mysql;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
+import com.alibaba.druid.sql.parser.Token;
+
+public class MySqlAlterTableTest17 extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "alter table rms.rms_Person_Event drop foreign key FKA382487726D72F65";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+
+        MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE rms.rms_Person_Event\n" + //
+                            "\tDROP FOREIGN KEY FKA382487726D72F65", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}