During the process of the integration and miniaturization design of electronics, the thermal analysis of the printed circuit breaker (PCB) has become a very important issue.This paper introduces an integrated calculation method that couples the calculation of the current distribution and the steady temperature field using the finite element software ANSYS.The temperature field of a typical PCB is calculated based on the thermoelectric coupling method.In addition, relevant experiment is also carried out, which confirms the validity of present calculation method and results.