A kind of training system of dimming, zooming and focusing of optical measurement equipment is presented. Firstly, the principle and mode of dimming, zooming, focusing and the training requirements are analyzed. Then, the training system is designed, which consists of an objective lens group, a dimming module, a zooming module, a focusing module, a color camera, a mechanical structure, the lens control module and a teaching and training operation software. Based on the task requirements for dimming, zooming and focusing, the training personnel calculate and analyze the number of pulses and the phase sequence required for step motor. Then, the corresponding software parameters and hardware connection are changed according to the pulse number and power-on phase sequence analyzed above. Through experimental phenomena and experimental data, the principles and laws of dimming, zooming and focusing are analyzed and summarized. Finally, the experiment of dimming, zooming and focusing subjects are carried out. The experiment shows that the system can meet the teaching and training requirements.