Abstract: the stepper motor is a kind of commonly used ac motor, the market still has a lot of mini stepper motor, in the whole motor market occupy a certain market share, has a good development prospect. It at the time of application because of improper use is easy to fail, and the abnormal vibration is one of them. This paper is to introduce the abnormal vibration of step motor in the use of reason and solution. Did not adjust step motor, rotor balance will appear in the process of running the vibration of normal, but the vibration is very small, will not result in a lot of noise, once the abnormal vibration, can cause a lot of noise, and the cause of the chatter is more, the rotor is round or not adjust balance is one of the reasons. Solution is: the strict control of the rotor manufacture and installation of quality or to adjust the balance of the rotor. Two, the abnormal vibration of structural components resonance stepper motor reasons include structure parts of resonance effects, this is because the motor in operation, the related components will be carried out in a certain operation, when running the vibrations affected to the motor itself. Settlement method is: will improve the structure components of to change its inherent frequency. Three, shaft bending axis is completely can cause the abnormal vibration of step motor, for the causes of vibration, can adopt the method are: by hammering method, heating method and grinding method of correction shaft. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone: