Combine harvester with axial feeding threshing roller was rapidly popularized in recent years due to its high threshing rate, low broken rate and high separating rate. The movement of cereal passing through the axial feeding threshing roller was analyzed based on reasonable assumptions. According to the nonlinear equations of cereal motion in each sector, feeding zone, concave side and cover side of threshingseparating zone, software which could analyze cereal state of motion was developed based on numerical method of high order Runge-Kutta. The effectiveness of numerical simulation result was verified compared with highspeed photography testing results. This study laid the foundation for the design of axial feeding threshing roller.