MoS2 coating on the bolt surface can improve its friction reduction performance and slow down wear,but it also leads to more complex thread surface wear mechanism during bolt connection.Simulation and experimental research was carried out to explore the friction interface failure mechanism of MoS2 coating bolted connection.The MoS2 coating was introduced into the finite element model of bolted connection structure by ABAQUS simulation software.The stress distribution and relative slip amplitude at the thread of the coated bolt under different preload and interfacial friction coefficients were obtained,and the accuracy of the model was verified by experiments.The results show that increasing the preloading force is helpful to prevent loosening of the bolted connection of MoS2 coating,but too much preloading force will increase the stress and strain at the interface of the bolted connection and produce plastic deformation,resulting in a decrease in the anti-loosening effect of the bolted connection.The increase of the interface friction coefficient will increase the stress and strain of the interface of bolted connection,resulting in the corresponding increase in the wear degree,and the first circle of working thread wear degree is the most serious.The stress distribution law and relative slip amplitude change trend of bolt surface with or without MoS2 coating are basically the same,and the stress concentration phenomenon occurs at the bottom of thread teeth.However,the stress value is relatively small after MoS2 coating is applied,and the wear degree of thread surface is reduced.The failure mechanism of friction interface is mainly fatigue wear.