diff --git a/SQL_RemoveCondition_demo.md b/SQL_RemoveCondition_demo.md
index 0654ed7..25fd70a 100644
--- a/SQL_RemoveCondition_demo.md
+++ b/SQL_RemoveCondition_demo.md
@@ -1,3 +1,4 @@
+# 1. Select Statemennt
 ```java
 final String dbType = JdbcConstants.MYSQL; // ORACLE or POSTGRESQL or SQL_SERVER or HIVE or ODPS
 
@@ -17,4 +18,53 @@ assertTrue(
 
 assertEquals("SELECT *\n" +
         "FROM t", stmt.toString());
+```
+
+# 2. DELETE Statement
+```java
+final String dbType = JdbcConstants.MYSQL; // ORACLE or POSTGRESQL or SQL_SERVER or HIVE or ODPS
+
+String sql = "delete from t where id = 2 and name = 'wenshao'";
+SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, dbType);
+SQLDeleteStatement stmt = (SQLDeleteStatement) parser.parseStatement();
+
+assertTrue(stmt.removeCondition("name = 'wenshao'"));
+
+assertEquals("DELETE FROM t\n" +
+        "WHERE id = 2", stmt.toString());
+
+assertTrue(
+        stmt.removeCondition("id = 2"));
+
+assertEquals("DELETE FROM t", stmt.toString());
+
+stmt.addCondition("id = 3");
+assertEquals("DELETE FROM t\n" +
+        "WHERE id = 3", stmt.toString());
+```
+
+3. UPDATE Statemennt
+```java
+final String dbType = JdbcConstants.MYSQL; // ORACLE or POSTGRESQL or SQL_SERVER or HIVE or ODPS
+
+String sql = "update t set val = ? where id = 2 and name = 'wenshao'";
+SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, dbType);
+SQLUpdateStatement stmt = (SQLUpdateStatement) parser.parseStatement();
+
+assertTrue(stmt.removeCondition("name = 'wenshao'"));
+
+assertEquals("UPDATE t\n" +
+        "SET val = ?\n" +
+        "WHERE id = 2", stmt.toString());
+
+assertTrue(
+        stmt.removeCondition("id = 2"));
+
+assertEquals("UPDATE t\n" +
+        "SET val = ?", stmt.toString());
+
+stmt.addCondition("id = 3");
+assertEquals("UPDATE t\n" +
+        "SET val = ?\n" +
+        "WHERE id = 3", stmt.toString());
 ```
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