In this section, the experimental researches have been carried out by using the control system and the control method designed in this paper for the HCWT. The step response coefficients and the relevant parameters of DMC are given in TABLE I. Because the designed fuel supply system has two different operation modes, namely uses pump control mode in the case of high temperature and big flow rate, uses proportional throttle valve control mode in the case of low temperature and small flow rate, the control of the gas temperature of the HCWT was achieved in two modes respectively. The step response results of the gas temperature from 1100 TC to 1300 C (the type of the wind tunnel is 900 C 1700 "C wind tunnel) in the pump control mode are shown in Fig 9, and the step response results of the gas temperature from 400 C to 600 C (the type of the wind tunnel is 400 c -900 Cwind tunne) in the proportional throttle valve control mode are shown in Fig. 10. From the experimental results, it can be seen that: in the pump mode, the response time of the system is about 15 sec, steady error of the temperature is about 10 c and the temperature has no overshoot; in the valve mode, the response time of the system is about 30 sec, steady error of the temperature is about 10 C and the temperature has no overshoot. The difference in response time is caused by the different control mode and different type ofwind tunnel in the two experiments. From the overall experimental results, it can be seen the DMC-PID cascade control method designed in this paper can achieve the control of the gas temperature HCWT, and the control accuracy is about t10 "C