Abstract: The 1 m hypersonic wind tunnel for the AVIC （FL-64） is the newly built blow down free jet type large-diameter conventional hypersonic wind tunnel in China. It adopts the blowing type operation mode, at the same time, considering the test requirements of low dynamic pressure, a vacuum exhaust system is also equipped. The overall performance, key component design, flow field calibration and preliminary standard model test results of the FL-64 wind tunnel are presented in detail. The performance of the wind tunnel are as follows: the range of Mach number: 4.0 – 8.0; the total pressure range of the settling chamber: 0.1 – 8.0 MPa; the total temperature range of the settling chamber: 300 – 900 K; the unit Reynolds number range: 3.3×10⁶ – 4.6×10⁷ m^–1; the effective operating time is not less than 30 s. The FL-64 wind tunnel combined the FL-60 trisonic （Subsonic, Transonic, Supersonic） wind tunnel forming the high and low Mach number range, this can cover the wide-speed range aircraft test with a Mach number of 0.3 – 8.0. Especially the duplication capability of the total enthalpy of Mach number 4.0 can match the real flight conditions. Overall, the successful completion of the FL-64 wind tunnel provide an effective test platform for the development of nation’s high Mach number aircraft.