diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerLexer.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerLexer.java
deleted file mode 100644
index 9cc562470a..0000000000
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerLexer.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.alibaba.druid.sql.dialect.sqlserver.parser;
-
-import java.util.HashMap;
-import java.util.Map;
-
-import com.alibaba.druid.sql.parser.Keywords;
-import com.alibaba.druid.sql.parser.Lexer;
-import com.alibaba.druid.sql.parser.Token;
-
-public class SqlServerLexer extends Lexer {
-
-    public final static Keywords DEFAULT_SQL_SERVER_KEYWORDS;
-
-    static {
-        Map<String, Token> map = new HashMap<String, Token>();
-        DEFAULT_SQL_SERVER_KEYWORDS = new Keywords(map);
-    }
-
-    public SqlServerLexer(char[] input, int inputLength, boolean skipComment){
-        super(input, inputLength, skipComment);
-        super.keywods = DEFAULT_SQL_SERVER_KEYWORDS;
-    }
-
-    public SqlServerLexer(String input){
-        super(input);
-        super.keywods = DEFAULT_SQL_SERVER_KEYWORDS;
-    }
-}
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerExprParser.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerExprParser.java
deleted file mode 100644
index c7892969e8..0000000000
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerExprParser.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.alibaba.druid.sql.dialect.sqlserver.parser;
-
-import com.alibaba.druid.sql.parser.Lexer;
-import com.alibaba.druid.sql.parser.ParserException;
-import com.alibaba.druid.sql.parser.SQLExprParser;
-
-public class SqlServerExprParser extends SQLExprParser {
-
-    public SqlServerExprParser(Lexer lexer){
-        super(lexer);
-    }
-
-    public SqlServerExprParser(String sql) throws ParserException{
-        super(sql);
-    }
-
-}
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerLexer.java b/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerLexer.java
deleted file mode 100644
index 9cc562470a..0000000000
--- a/src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SqlServerLexer.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.alibaba.druid.sql.dialect.sqlserver.parser;
-
-import java.util.HashMap;
-import java.util.Map;
-
-import com.alibaba.druid.sql.parser.Keywords;
-import com.alibaba.druid.sql.parser.Lexer;
-import com.alibaba.druid.sql.parser.Token;
-
-public class SqlServerLexer extends Lexer {
-
-    public final static Keywords DEFAULT_SQL_SERVER_KEYWORDS;
-
-    static {
-        Map<String, Token> map = new HashMap<String, Token>();
-        DEFAULT_SQL_SERVER_KEYWORDS = new Keywords(map);
-    }
-
-    public SqlServerLexer(char[] input, int inputLength, boolean skipComment){
-        super(input, inputLength, skipComment);
-        super.keywods = DEFAULT_SQL_SERVER_KEYWORDS;
-    }
-
-    public SqlServerLexer(String input){
-        super(input);
-        super.keywods = DEFAULT_SQL_SERVER_KEYWORDS;
-    }
-}