Abstract: A sector-PDE(pulse detonation engine) with an internal diameter of 90 mm and an external diameter of 200 mm was designed.Its length is 1 500 mm and its sector angle is 60°.Two types of air-valves(orifice type and vortices type,respectively) were used to get appropriate mixture of air and oil,and their performances on detonation were compared.The results indicated that the designed PDE could operate at a frequency up to 40 Hz.In addition,the text gives the results of different shock-wave reflectors' comparison: the inverted reflector has high performance on initiating detonation.