Numerical simulation and calculation were performed on the gas-phase flow field of the straight tangential cyclone with single entry，straight tangential cyclone with double entries， bias tangential cyclone with single entry，bias tangential cyclone with double entries，bias tangential helicoidal cyclone with single entry，bias tangential helicoidal cyclone with double entries by using RSM model. Results showed that，the pressure field and velocity field of the cyclone with double entries had better symmetry and stability；only changing the inlet angle had a limited influence on the pressure field and velocity field. When the tangential velocity distribution were similar in the six kinds of cyclone studied in this article，compared with other cyclones’， the pressure drop of the bias tangential helicoidal cyclone decreased about 25 %；the inlet total pressure needed was about 17 % lower；the energy consumption dropped about 17 %. Moreover，bias tangential helicoidal cyclone with double entries（XS-L type）had a better energy efficiency ratio，and its performance was the most excellent.