In order to study tool wear more accurately,it is very important to establish tool wear model.At present,the main tool wear models are classical tool wear model and tool wear prediction model,and tool wear prediction models are mainly artificial neural network,hidden Markov model and support vector machine model .The tool wear mechanism in aluminum alloy cutting process was analyzed,several classic tool wear models were summarized,and the tool wear prediction model was combed.The main wear mechanisms of aluminum alloy cutting tools were adhesive wear,diffusion wear and abrasive wear.The results show that the theoretical model of tool wear considering diffusion wear on the basis of adhesive wear and abrasive wear is closest to the actual machining.