A method to check the performance of the motor in the photoelectric search and tracking system is presented in this paper.In this method,the motor working area is superimposed with the load working area,and the inclusion relation between the two areas is used to judge whether the motor meets the requirements of the load .This method makes up for the deficiency of the traditional motor performance checking method.When the load runs to some extreme conditions,it may lead to the motor cannot meet the technical requirements.The method is simple,and is more perfect and reliable than the traditional motor performance checking method.