At present,the complicated PDC bit still adopts artificial flame brazing,and the welding quality is not stable enough.Aiming at the problem,a temperature control system was designed based on the double-loop PID structure combining with the brazing process of the PDC bit.Taking PID control algorithm and hierarchical control idea as the core,multi-task software was designed based on embedded real-time operating system RT-Thread,and real-time measurement,precise control and display of brazing temperature were realized.The experimental results show that the system can well meet the brazing temperature requirements of PDC bits.