Abstract: Considering the characteristics of on-site induction brazing of tubes, the FEM model was built.Based on the electromagnetic and thermal coupled finite element method, the temperature distribution on tubes was simulated by ANSYS.The results show that temperature distribution on tubes is nonuniform.Using a six-point synchronous temperature measurement system with thermocouples, the temperature was measured.It is shown that the simulation results are in accordance with the experimental results.The present work not only provides a scientific basis for the position selection of temperature measurement, design of control method, and the analysis of welding defects, but also puts forward a method to optimize the process and improve the temperature distribution on tubes.