Hot enters into stirring and crushing and drying chamber from the bottom of drier with suitable atomizing speed. It exerts strong shearing, blowing , floating and rotating effect to raw material. Therefore raw material is granulated through centrifuge, shearing, impacting and friction effect. It strengthens the process of geat exchange. At the bottom of drier, the lage and damp granule is crushed under the action of stirer and the granule that is small in partical and contain less moisture will lift accompanied with revolving air stream. During the periaod of lift, it is dried further. Because gas and solid two phase flow in rotating and the intertia of solid phase is more than that of gas and the relative velocity between solid and gas phase is large, so it strengthens the process of .