In order to know more about the characteristics of the valveless piezoelectric pump with Y-shape tubes

and make it meet well with the needs of transporting blood and fluid

simulative and experimental analysis are applied on the pump to explore its pump flow rate and the fluid flowing state in the pump. The commercial finite element software CFX is employed to simulate the fluid flowing state in the pump firstly

and the simulative results reveal that the pressure in the pump chamber varies mildly

and vortex that exists in the pump chamber hardly do harm to the results of transporting living cells and long-chain-marcomolecule cells. Then the valveless piezoelectric pump was made

and by changing the geometrical dimensions of the Y-shape tubes

the variational principle of pressure drop between the outlet and the inlet of the pump is explored. The experimental results show that the pressure drop decreases when the angle between two branches increases

and reaches minimum when the sum of the width of two branches is close to that of the main tube

and when the branch angle is 5°

and the width of the branches is 1.2mm

the pressure drop reaches a maximal value of 74mm.