First, the importance of developing hypersonic quiet tunnel facility and techniques was pointed out, and the basic characteristics of quiet tunnel were briefly discussed. Second, according to foreign and domestic experience and research results of developing quiet tunnel, the project about aerodynamic and structural research of mach 6 Hypersonic Quiet Wind Tunnel was presented. Furthermore, the design details of valves, settling chamber and slot exhaust of nozzle were proposed. Finally, M6HQWT design Mach number is 6.0, nozzle outlet diameter 120mm, T₀500K,P₀1-5MPa and operation duration 20-30s. M6HQWT is the first hypersonic quiet wind tunnel in China, and can be used for experimental teaching and basic scientific research.