The hypersonic inward turning inlet with water-drop like shape to circular shape tr ansition is designed with the technology of streamline tracing and gradual change section, based on the axisymmetric basic flow field with controllable Mach number distribution law.The effects of transverse position d, the lengthway position h and the inlet curve parameter a are analyzed. The inlet with rectangular to circular shape transition is designed under the same condition and compared with the water-drop like shape to circular shape transition inlet. The results show that the studie parametersd have great effect on the overall performance of the water-drop like shape to circular shape transition inlet at the design point, and the overall performances of the inlet is obviously better than that with the rectangular to circular shape transition inward turning inlet in conditions of the same capture area and internal contraction ratio.