Aimed at the micro phenomenon caused by interference fit of a certain type of engine connecting rod bushing and small head,the contact process of connecting rod small end components at the moment of detonation pressure was analyzed by using finite element method.The orthogonal simulation test project was established by selecting the interference and friction coefficient as experimental factors,and the influence of interference and friction coefficient on fretting characteristics of connecting rod bushing was investigated.The results show that with the increase of the amount of interference,the connecting rod bushing contact pressure is increased,friction stress is decreased.With the increase of the friction coefficient,the maximum contact pressure of the connecting rod bushing is increased first and then decreased,and the maximum friction stress is increased.The friction on the surfaces between connecting rod bushing and small head has significant effects on the fretting characteristics of connecting rod bushing.