Abstract: In order to meet the requirement for the testing of the advanced aircrafts' thrust vectoring techniques in high speed wind tunnel, a device for the flexible metal bellow system's calibration of the performance impact on thrust vectoring balance and the corresponding high precision flow close-loop measurement and control system based on the digital flow valve are developed. A test platform for a twin-engine aircraft thrust vectoring, including the supply lamina support, the flexible metal bellow for realizing the jet air supply and three balances system, is established. Separate measurement of both aerodynamic characteristics and propulsion characteristics is achieved simultaneously. The system adjustment and the results of model tests demonstrate that, the experimental equipment and the overall system operate accurately and steadily, the precision of jet mass flow measurement is better than 0.5%. The experimental results of aerodynamic characteristics and propulsion characteristics obtained in the research are normative and reasonable, and the precision of repeatability tests is up to the standard of GJB. The experimental skills obtained in the research can satisfy the twin-engine aircraft requirement, and the test condition is within the margin of Mach number of 0.3~1.2, angle of attack of-10°~60°, nozzle thrust vector angle of-20°~20°, jet mass flow 0~3kg/s.