Abstract: Rotating cyclone centrifuge is a new type of centrifuge, combining the rotating centrifugal field with the cyclone centrifugal field. It has a strong centrifugal field and high separating ability;. It is an ideal solid-liquid seperating equipment. Based on the hydraudynamic equations, the velocity and pressure field in the drum are analysed under piston flow states. The common equations of velocity and presure distribution have been got. They are the basis of calculating the capacity and separating size of the centrifuge. The regular pattern of the rotating cyclone centrifugal field is studied at the end of this paper and some useful conclusions are got.

Key words: Centrifuge, Cyclone separator, Fluid velocity, Fluid dynamics