With the velocity and the pressure of opening valve of hydro-pneumatic spring,throttle aperture design formula of hydro-pneumatic was built,the affection of superposition throttle slices and adjustment gasket thickness on the throttle aperture was analyzed.

The design formula of throttle aperture of hydro-pneumatic spring was established according to the relationship between pressure and flux.

When the floating ring hybrid thrust bearing with the structure of deep and shallow cavity crevice throttle runs in high speed,with the increase of inertia force,the fluid state transforms from laminar flow to turbulent flow.