diff --git a/index.d.ts b/index.d.ts
index 35465f7..a3e9117 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -495,6 +495,7 @@ export declare class MigrationInterface {
   }): void;
 
   /**
+   * create column in table
    * @param columnName 
    * @param columnType 
    * @param tableName 
@@ -513,6 +514,16 @@ export declare class MigrationInterface {
     after?: string,
   }): void;
 
+  /**
+   * add column to table
+   * @param tableName 
+   * @param columnName 
+   * @param options 
+   */
+  addColumn(tableName: string, columnName: string, options?: {
+    type: FieldType,
+  } & CreateColumnOptions): void;
+
   createIndex(tableName: string, columns: string[], options?: {
     indexName?: string,
     unique?: boolean,
@@ -541,4 +552,6 @@ export declare class MigrationInterface {
   dropForeignKey(foreign_key: string, tableName: string): void;
 
   insertData(table: string, data: any[]): void;
+
+  raw(sql: string, values: any[]): void;
 }
diff --git a/src/migration.js b/src/migration.js
index 34e8ad0..0635ec2 100644
--- a/src/migration.js
+++ b/src/migration.js
@@ -178,6 +178,7 @@ function _initMigration(file, queries = {}) {
       queries[file].push({ sql: builder.sql, values: builder.values });
     }, ...baseAttr
   });
+
   Object.defineProperty(migration, 'createColumn', {
     value: function (name, type, table, options = {}) {
       _assign(options, {
@@ -192,6 +193,19 @@ function _initMigration(file, queries = {}) {
     }, ...baseAttr
   });
 
+  Object.defineProperty(migration, 'addColumn', {
+    value: function (tableName, columnName, options = {}) {
+      _assign(options, {
+        operator: 'create',
+        target: 'column',
+        table: tableName,
+        name: columnName
+      });
+      const builder = new ManageSQLBuilder(options);
+      queries[file].push({ sql: builder.sql, values: builder.values });
+    }, ...baseAttr
+  });
+
   Object.defineProperty(migration, 'createIndex', {
     value: function (table, columns, options = {}) {
       _assign(options, {
@@ -279,6 +293,12 @@ function _initMigration(file, queries = {}) {
     }, ...baseAttr
   });
 
+  Object.defineProperty(migration, 'raw', {
+    value: function (sql, values) {
+      queries[file].push({ sql, values });
+    }, ...baseAttr
+  });
+
   return migration;
 }
 
@@ -328,5 +348,6 @@ async function end(context) {
 module.exports = {
   init,
   run,
+  _initMigration,
   end
 };
diff --git a/tests/migration.tests.js b/tests/migration.tests.js
new file mode 100644
index 0000000..ce7db4d
--- /dev/null
+++ b/tests/migration.tests.js
@@ -0,0 +1,246 @@
+'use strict';
+
+let expect = null;
+const { _initMigration } = require('../src/migration');
+
+describe('migration test case', () => {
+  before(async function () {
+    const chai = await import('chai');
+    expect = chai.expect;
+  });
+
+  describe('addColumn method', () => {
+    it('should add column to queries with basic options', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.addColumn('users', 'email', {
+        type: 'varchar',
+        length: 255
+      });
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.include('ALTER TABLE `users` ADD COLUMN');
+      expect(queries[file][0].sql).to.include('`email` VARCHAR(255)');
+      expect(queries[file][0].values).to.be.an('array');
+    });
+
+    it('should add column with all options', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.addColumn('users', 'age', {
+        type: 'int',
+        length: 11,
+        unsigned: true,
+        allowNull: false,
+        default: 0,
+        comment: 'User age',
+        autoIncrement: false,
+        primaryKey: false,
+        uniqIndex: false
+      });
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.include('ALTER TABLE `users` ADD COLUMN');
+      expect(queries[file][0].sql).to.include('`age` INT(11)');
+      expect(queries[file][0].sql).to.include('UNSIGNED');
+      expect(queries[file][0].sql).to.include('NOT NULL');
+      expect(queries[file][0].sql).to.include('DEFAULT 0');
+      expect(queries[file][0].sql).to.include('COMMENT \'User age\'');
+    });
+
+    it('should add column with nullable and default null', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.addColumn('users', 'bio', {
+        type: 'text',
+        allowNull: true,
+        default: null
+      });
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.include('ALTER TABLE `users` ADD COLUMN');
+      expect(queries[file][0].sql).to.include('`bio` TEXT');
+      expect(queries[file][0].sql).to.include('DEFAULT NULL');
+    });
+
+    it('should add column with timestamp default', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.addColumn('users', 'created_at', {
+        type: 'datetime',
+        default: 'timestamp'
+      });
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.include('ALTER TABLE `users` ADD COLUMN');
+      expect(queries[file][0].sql).to.include('`created_at` DATETIME');
+      expect(queries[file][0].sql).to.include('DEFAULT CURRENT_TIMESTAMP');
+    });
+
+    it('should add column with auto increment', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.addColumn('users', 'id', {
+        type: 'int',
+        autoIncrement: true,
+        primaryKey: true
+      });
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.include('ALTER TABLE `users` ADD COLUMN');
+      expect(queries[file][0].sql).to.include('`id` INT(11)');
+      expect(queries[file][0].sql).to.include('NOT NULL');
+      expect(queries[file][0].sql).to.include('AUTO_INCREMENT');
+    });
+
+    it('should add column with after clause', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.addColumn('users', 'middle_name', {
+        type: 'varchar',
+        length: 100,
+        after: 'first_name'
+      });
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.include('ALTER TABLE `users` ADD COLUMN');
+      expect(queries[file][0].sql).to.include('`middle_name` VARCHAR(100)');
+      expect(queries[file][0].sql).to.include('AFTER `first_name`');
+    });
+
+    it('should add multiple columns to same file', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.addColumn('users', 'email', { type: 'varchar', length: 255 });
+      migrationObj.addColumn('users', 'phone', { type: 'varchar', length: 20 });
+
+      expect(queries[file].length).to.be.equal(2);
+      expect(queries[file][0].sql).to.include('`email`');
+      expect(queries[file][1].sql).to.include('`phone`');
+    });
+  });
+
+  describe('raw method', () => {
+    it('should add raw SQL to queries', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.raw('SELECT * FROM users WHERE id = ?', [1]);
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.be.equal('SELECT * FROM users WHERE id = ?');
+      expect(queries[file][0].values).to.deep.equal([1]);
+    });
+
+    it('should add raw SQL with multiple values', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.raw('INSERT INTO users (name, email) VALUES (?, ?)', ['John', 'john@example.com']);
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.be.equal('INSERT INTO users (name, email) VALUES (?, ?)');
+      expect(queries[file][0].values).to.deep.equal(['John', 'john@example.com']);
+    });
+
+    it('should add raw SQL with empty values array', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.raw('CREATE INDEX idx_test ON users (name)', []);
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.be.equal('CREATE INDEX idx_test ON users (name)');
+      expect(queries[file][0].values).to.deep.equal([]);
+    });
+
+    it('should add multiple raw SQL statements', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.raw('UPDATE users SET status = ? WHERE id = ?', ['active', 1]);
+      migrationObj.raw('DELETE FROM logs WHERE created_at < ?', [new Date('2020-01-01')]);
+
+      expect(queries[file].length).to.be.equal(2);
+      expect(queries[file][0].sql).to.be.equal('UPDATE users SET status = ? WHERE id = ?');
+      expect(queries[file][0].values).to.deep.equal(['active', 1]);
+      expect(queries[file][1].sql).to.be.equal('DELETE FROM logs WHERE created_at < ?');
+      expect(queries[file][1].values[0]).to.be.instanceOf(Date);
+    });
+
+    it('should add raw SQL with complex values', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      const values = [1, 'test', null, true, false, 123.45];
+      migrationObj.raw('INSERT INTO test VALUES (?, ?, ?, ?, ?, ?)', values);
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.be.equal('INSERT INTO test VALUES (?, ?, ?, ?, ?, ?)');
+      expect(queries[file][0].values).to.deep.equal(values);
+    });
+
+    it('should add raw SQL with JSON values', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      const jsonData = { key: 'value', nested: { data: 123 } };
+      migrationObj.raw('UPDATE users SET metadata = ? WHERE id = ?', [JSON.stringify(jsonData), 1]);
+
+      expect(queries[file].length).to.be.equal(1);
+      expect(queries[file][0].sql).to.be.equal('UPDATE users SET metadata = ? WHERE id = ?');
+      expect(queries[file][0].values[0]).to.be.a('string');
+      expect(queries[file][0].values[1]).to.be.equal(1);
+    });
+
+    it('should add raw SQL mixed with other migration methods', () => {
+      const queries = {};
+      const file = 'test_migration.js';
+      queries[file] = [];
+      const migrationObj = _initMigration(file, queries);
+
+      migrationObj.raw('SET FOREIGN_KEY_CHECKS = 0', []);
+      migrationObj.addColumn('users', 'email', { type: 'varchar', length: 255 });
+      migrationObj.raw('SET FOREIGN_KEY_CHECKS = 1', []);
+
+      expect(queries[file].length).to.be.equal(3);
+      expect(queries[file][0].sql).to.be.equal('SET FOREIGN_KEY_CHECKS = 0');
+      expect(queries[file][1].sql).to.include('ALTER TABLE `users` ADD COLUMN');
+      expect(queries[file][2].sql).to.be.equal('SET FOREIGN_KEY_CHECKS = 1');
+    });
+  });
+});
+