Abstract: A simulation train method based on digital image injection was presented to complete the training task of capturing and tracking target and to build the target environment. By simulating the target flight path, the output values of an encoder were received and calculated in real time, a comprehensive treatment with the equations of target motion was completed, and the target location information in images was worked out. Then, the digital image was injected into a digital image processing system according to the format of infrared images after synthesizing the target into the background. This method can simply and conveniently complete the tracking tasks in manual and automatic methods without using the infrared cameras, and can significantly reduce training costs. The method has been successfully used in the simulation training system of a photoelectric tracking and pointing apparatus.