Abstract: The history of the visual system of locomotive simulator is reviewed, with the advantages of the traditional methods analyzed. Based on the distinguishing feature of this system, and through a thorough study on the encoding theory and image sequence, a new thought and concept to design the visual systemof locomotive simulatorwith video compression technique is put forward. The design scheme of the system based on the MPEG-1 standard is introduced in detail, including compression/decoding system, the algorithm of changing the playback speed smoothly based on the analysis of image sequence and the interpolation method between time frame under the situation of low speed. In order to simulate the change of circumstances, a processing method for particular effect is also proposed.