In order to achieve the precise control of the gas temperature of the HCWT, a control system of the gas temperature for the HCWT is designed in this paper, which included the fuel supply system, the field PLC control system and the remote PC control system. And on this basis, addressing the characteristics in the system, such as time delay, difficult to establish a precise mathematical model, a DMC-PID cascade control law is proposed to achieve the precise control of the gas temperature of the HCWT.