A simplified judgment method,which can be solved by mathematical analysis,is described for judging the engineering realizability of the tracking accuracy of photoelectric system in the paper.The judgment method in this paper is a necessity judgment,which uses the closed-loop bandwidth of the tracking system to evaluate the realizability of the tracking accuracy of the system.The sufficiency also depends on other conditions,such as the selection of motor.This paper takes tangentially uniform linear motion(variable angular acceleration) as an example to analyze the motion characteristics of the target,takes the double closed-loop system of speed loop and position loop of DC brushless torque motor as an example,and based on classical control theory,simplifies the model to analyze and solve the bandwidth required for tracking.at last,the simplified model is simulated to verify the calculation accuracy of the simplified model.