Abstract: Two kinds of software packages were introduced and compared about their functions and characteristics.The simulated results of the temperature field of stainless steel SUS310 in GTAW process showed that pre-data-treatment and post-data-treatment of MARC are more powerful than those of PHOENICS,so it is easy for users to input the boundary conditions and get the results in MARC.But in PHOENICS,the interfaces to the other software packages are provided for the post-data-treatment,and the results can be operated easily in this way.There is some difference between the results simulated by two software packages as the solvers are not the same.In MARC,there are several integral points used to solve the results in every grid,while in PHOENICS,the staggered grid technique is used.Simulated results of the two software packages show that the highest temperature calculated with MARC is(600℃) higher than that with PHOENICS.