This paper proposes an autonomous parking algorithm of car-like mobile robot using a docking-formation. Unlike the previous works based on high performance processors and big movement load, the proposed control law can provide simple and low cost parking system. Since the parking problem can be redescribed as a posture control of car-like mobile robot with non-holonomic constraint, the docking algorithm based on the docking-formation can be applicable in spite of any initial position of the robot, and also, it can be employed to the garage and parallel parking situations.