In order to make the valveless piezoelectric pump with hemispheresegment bluffbody meet well with the needs in such areas as medical treatment and aeronautics and astronautics, the performance of this pump needs to be analyzed.Firstly,the structure and working principle of valveless piezoelectric pump with hemispheresegment bluffbody are introduced. Secondly, the flow resistance of the pump is analyzed theoretically. A simulation analysis of the flow field of this pump is carried out by using the finite method.From the result of simulation,we can found 〖HJ〗that during the positive and negative direction the fluid′s velocity decrease with increasing hemisphere of radius,and the amplitude of variation of pressure in the chamber is gentle.Finally we manufactured a sample pump and some series of hemispheresegment bluffbody with different radius.The experiment results show that the maximum output flow rate decreases with increasing hemisphere of radius,and the maximum output flow rate is 121.4 mL/min when the radius of the hemispheresegment bluffbody is 4.0 mm and the voltage is 150 V.These results demonstrate the hemispheresegment bluffbody can be used as nomovingparts valve, and the feasibility of this pump.