Abstract: The forging tests of M2 high speed steel for machining tools were carried out by using conventional forging and PID temperature control forging methods respectively,and the microstructure and wear resistance of the samples forged by the two methods were compared and analyzed.The results show that during conventional forging,the carbides in M2 high speed steel are not only fine particles,but also large lumps and a small amount of fishbone.When PID control forging is used,the carbides in the sample are fine granular with dispersive distribution.Compared with that of the conventional forging,the microstructure of M2 high speed steel forged by using PID control is obviously refined and the microstructure is more uniform;after friction and wear time of 10 min,the wear volume of the PID controlled forged specimen is decreased from 30×10^-3mm~3to 19×10^-3mm~3,which is reduced by 11×10^-3mm~3.The forging temperature optimized by PID control can be used to effectively improve the internal structure of M2 high speed steel,and improve the wear resistance of the steel.