Abstract: Sliding bearing as an important power transmission component of the engine,the quality of bearing plays an important role in the performance of the engine.In this paper,three kinds of antifriction alloy materials are introduced:babbitt metal、Copper base alloy、Aluminum base alloy,generally,the alulninum base bearing can be plated on the material to solve the problem of aluminum alloy itself.In this paper,the research and application of DLC film at home and abroad are discussed.Aiming at the phenomenon that three is a great stress on the coating on aluminum alloy,the proposed methed is proposed to alleviate the shress of the transition layer,thermal annealing and doping elements in DLC films.With the increasing demands of the performance of the engine,and the need to protect the environment,DLC film has great development prospects in the engine bearing.