Abstract: In plateau areas， there were some factors about thin air and lower air pressure influencing excess air coefficient and filling coefficient of engine， on the other hand， the lower methane gas caused the reduced engine power. According to the characteristics of the northwest plateau area， this paper showed a design study of gas supplying system， oil supplying system and so on after comparing some diesel gas dual fuel engine modification schemes， and then put forward a kind of dual fuel engines to be applicable to the region with lower cost， on this basis， a hydrogen high pressure injection system was raised to improve the dynamic performance and strong adaptability for several work conditions， and save the development time and reduce the cost.

Key words: plateau area, dual fuel, high pressure injection, engine