Abstract: The finite element model for the brazing of the thrust chamber has been established based on the closed-loop control of electric power in heater band of vacuum furnace. After analyzing the transient temperature field and the strain-stress distribution of thrust chamber through the weak thermal-mechanical coupled method, the temperature difference between the thermocouple and the chamber wall is determined, and the temperature distribution of the chamber wall is also obtained. The strainstress shows that the buckling of the pressed inner wall nearby the throat is easily generated during brazing. The results will lay a theoretical foundation for improving the brazing procedure and exploring the failure mechanism of thrust chamber wall. The improved brazing procedures are put forward and verified by brazing test.