Based on the Ansoft Maxwell, the factors affecting the performance of single phase stepping motor were analyzed. The results showed that operating temperature and input voltage significantly affected the performance of the motor, therefore, the application field and condition of the machine should be fully considered. Axiality and air gap, to an extent, had an effect on the performance of the motor, hence the optimal design of them should be guaranteed. Geometrical tolerances had minimal impact on the performance of the motor, which could be neglected.