The flow dynamic behaviors and characteristics of a staggered viscous pump with two rotating cylinders were numerically investigated by 2-D laminar model.The flow field of the staggered viscous pump can be divided into three regions

or the downstream region without vortex

the upstream region with vortex

and the region between two rotors.The flow field in the region between two rotors develops with the rotor spacing rising

and there appears obvious vortex with large rotor spacing.As Reynolds number increases

the dimensionless flow rate significantly drops for large vortex

and it approaches to constant at low Reynolds number.As the rotor eccentricity rises

the dimensionless flow flux increases almost linearly for the nonequilibrium effect

and the dimensionless driving power increases with smaller amplify.When the rotor spacing rises

the dimensionless flow flux drops

while the driving power will first increase and then decrease.