By finite element software Ansys the simulation on temperature and heat transfer of tool and die in hot extrusion process of TP304 austenite stainless steel tube to get the distribution of temperature and heat flux of die steel X38CrMoV5-3 extruding needle in hot extrusion process and the specification parameters and needed water volume for extruding different tube sizes are obtained by calculation. The application of production of φ57.0 mm X 6.3 mm~φ139.7 mm x 20.0 mm TP304 austenite stainless steel tubes show that with improvement o£ cooling process the service life of extruding needle with outside diameter ＜100 mm increases from 50~100 times/per piece to 100~150 times/per piece

and that with outside diameter ≥100 mm increases from 100~200 times/per piece to 150~200 times/per piece

the production cost decreases and the production rate increases obviously.