The gas phase flow field and gas pressure in a rotating zigzag bed were simulated with computational fluid dynamics (CFD). The effects of rotational speed and gas flow rate on the inner and outer of the rotor velocity distribution and gas pressure was studied and analyzed. The model was validated by experimental results. The results show that the averaged relative error between experiments and calculation is less than 9%. Gases from outside into the rotor, the rotor speed obvious changes have taken place. Tangential velocity of total speed by 76.1%~76.1%, axial velocity and radial velocity is very small. As the gas flow rate and rotating speed increases, the tangential velocity increase obviously. Gas flow inside of the rotor, there is a low pressure value and a high pressure value in the near rotation baffle, there is a large and a small vortex, a counterclockwise, a clockwise. In their border, gas flow more severe and the gas outlet close to the shaft, also gas existing reflux, but speed is smaller.