Abstract: The TPS testing technology is one of the best methods to study the aircraft/propulsion integrated design in wind tunnels. TPS units, used as engine simulators, are driven by high pressure air. As a result, the mass flow control accuracy of high pressure air has a direct relationship with the wind tunnel testing accuracy. Because of space limits of wind tunnel testing models, the external mass flow control method can not control more than 2 TPS units. In order to overcome deficiencies of the external mass flow control method, a kind of internal mass flow control device was designed. This device integrates the control and measure function, and can control 4 TPS units simultaneously. A check test was conducted in the TPS testing chamber of CARDC. The testing results indicate that the device has good linear mass flow control ability, the control resolution is better than 0.15 g/s, and the control repeatability accuracy is better than 3 g/s. A full model TPS test was conducted in the 8 m×6 m low speed wind tunnel of CARDC as well. The repeatability testing accuracy meets the demands of GJB, which verifies the control accuracy of the device.