The principle and working function of the photoelectric platform is introduced in the article. The classical control method of the velocity loop and the position loop is also described in the article. For improving the tracing precision of the system . the complex control in the digital-leading system of the photoelectric platform is put foreward. The principle and limitatiion of the feedforward control is depicted in the article.. and the article particularly describes the design method of the feedforward control in the system .the experiment result is provided. The results show that the digital-leading tracing precision of the system is improved with the feedforward control and it does not change the closed-loop property of the system