Abstract: 3-D visualizationis valuable for forecasting wheat production, as well as the breeding, yield, and cultivation of the crop. However, developing the technique to virtually simulate wheat leaves faced difficult challenges in the past. This study attempted to overcome the obstacle by applying selected measurements on the leaves to feed in the Non-uniform rational Basis spline(NURBS) mathematic model for a 3-D graphic representation of the leaves. Firstly, the algorithm for control points of the main veins on a wheat leaf was established. Secondly, the coordinates for the NURBS surface control points were calculated. And, finally, a simulation model under different control point sequence was constructed with the aid of open Graphics Library(OpenGL). The resulting algorithm was found to be highly efficient, and the simulated image sexceedingly smooth and realistic.