A extension knowledge push model of automobile engine design was studied, aiming Aiming at at the problem that designers have a large demand and different requirements for design knowledge in the process of automobile engine collaborative design，the extension knowledge push model of automobile engine design is studied. Firstly，the extension push architecture of automobile engine design knowledge iwas established，and the design flow framework of the vehicle engine design extension knowledge push model iwas given. Then，,the extension element model of automobile engine design knowledge iwas established and fuzzified. Based on this，the construction process of the automobile engine design extension knowledge base iwas put forward. Finally，, the automobile engine knowledge push extension correlation function model was constructed based on the extension knowledge base，the automobile engine knowledge push extension correlation function model is constructed，,and then the extension knowledge push model for automobile engine design iwas established. The collaborative design results of collaborative design of thean automobile engine shows that the extension knowledge push model proposed for the automobile engine design is effective and feasible.