Design Of Stepping Motor Control System Based On MCU&PC Abstract:Stepping motor is an actuator that can convert the pulse signal to degree displacement.When stepping Drivers receive a pulse signal, it stepper motor driven in the direction set by a fixed rotation angle. By controlling the number of pulses that can control the angular displacement, thus achieving the purpose of accurate positioning. In the paper the control method has been has been discussed in detail,which MCU has been used to control the stepping motor.Implement methods of how to forword and reverse are analyzed.Then the principle of speed regulation was researched to provide reference for application of the stepper motor.PC and MCU by Serial Communication to control the stepping motor.The design has great generality.For different stepping motors,the function has been realized by modify corresponding circuit and program.The practice shows that the system has great flexibility. Keywords:MCU STC89C52;Stepping motor 42BYG131;Serial Communication; speed regulation