Abstract: In this paper,the research status of inertial friction welding of steel and other alloys,aluminum alloy and other alloys,titanium alloy and other alloys,high temperature alloy and other alloys was described. The selection of process parameters,design of end plane,preheating before welding and post-welding heat treatment of inertial friction welding were summarized. The problems existing in inertial friction welding of dissimilar alloys were analyzed and summarized. The results showed that the joint with the same strength as the base metal and good welding quality could be obtained by adopting reasonable process parameters,designing difform end plane,adding intermediate transition layer,preheating treatment before welding and post-welding heat treatment. Suggestions in the follow-up study were that process parameters of the inertia friction welding of dissimilar alloy and design of end plane were optimized by combining with numerical simulation,element distribution and amount and type of newly formed phase of the joint were adjusted and controlled,and flow behavior of metal at welding interface was studied in depth to obtain a better comprehensive performance dissimilar alloy inertia friction welded joint.