Stepper motor is an electromechanical device that directly converts electrical impulses into mechanical motions. By controlling the sequence, frequency and quantity of electrical impulses applied to the motor coils, we can control the steering, speed and rotation angles of stepper motors. Without the help of closed-loop feedback control with position sensing system, using stepper motor and related supporting driver to composite a simple, low-cost open-loop control system, we can achieve precise position and speed control.