Magnetron is a compartment of microwave oven and it generates the microwave. In this paper, the program HUSAP is developed in order to perform the heat transfer, structure, and fatigue analysis of magnetron. By using it we can make the geometry of magnetron and can solve the governing equations which are formulated by finite element technique. In order to achieve the reliability of HUSAP, we compare it with experiment and commercial software ANSYS. And comparisons of observed results show that agreement is remarkably consistent.