In order to determine the optimal operation parameters, experimental study was carried out on rotate velocity and inclination angle of alfalfa seed pelleting kettle. The results showed as follows: in order to make the kettle bottom paved with alfalfa seeds, rotate speed must be increased while the inclination angle increased. When the inclination angle took a certain value, the rotate speed must be in little range to make alfalfa seed pave the kettle thoroughly. The optimal inclination angle was 36°～42°, and optimal rotate speed was 28～39r/min.