Three-dimensional sidewall inlet was designed according to curved surface with wall Mach number linear distribution, and obtained curved surface compression sidewall inlet with both topwall and sidewall using curved surface. The inlet was analyzed by numerical simulation and carried out with wind tunnel test. The results show that the inlet's wall pressure distribution changes smoothly under using curved surface, especially having a good performance under off-design condition. Under Ma=6 and zero angle of attack wind tunnel test, curved surface compression sidewall inlet has a total pressure recovery of 0.544, exit Mach number of 2.70, and pressure ratio of 28 relative to wind tunnel static pressure. NomenclatureMa = Mach number H = height p = static pressure T = static temperature P* = total pressure T* = total temperature Φ = flow capture ratio, diameter σ = total pressure recovery π = pressure ratio h = altitude q = dynamic pressure Subscripts ∞ = freestream flow condition throat = throat section of inlet exit = outlet of isolator C = capture 1 Graduate Student,

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