Abstract: Due to intricacy of tissues and boundaries of body, it is very difficult to get a precise three-dimension temperature field about studied model of body. Boundary element methods was utilized to understand the meanings of equations of model effortlessly, to make calculation simply and to get a three-dimension temperature field easily, since it has one characteristic, which approximate calculation is only based on unknown functions on the dots of boundary fulfilling integral calculus equations. The result proved that boundary element methods has well advantages compare with other numerical methods in dealing with complicated boundary, programming and the time of computation, and tallied with experiment and other methods.