In order to reduce the cutting force of high strength,high hardness material cutting,and reduce temperature and tool wear in machining area,the simulation experiments of YT726 tool cutting GCr15 steel were carried out with electric conducting heating.By using finite element calculation and regression analysis method based on DEFROM3D,the relationship among cutting depth,cutting speed,feed rate and heating current were studied,the calculation formula of the main cutting force of YT726 tool cutting GCr15 steel was put forward.The results show that the main cutting force is positively correlated with cutting speed,feed rate and cutting depth,and negatively correlated with cutting temperature.When the heating current is greater than a certain value,the main cutting force is also negatively correlated with the heating current,and with the increasing of heating current,the main cutting force is decreased.