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A simple modeling method for plant petal was presented. The modeling process could be realized easily. The initial shape of the model was a rectangle surface. A variety of deformation functions were adopted to change rectangle outline and approach petal outline. The surface-position vector of plane surface was modified by adding a perturbation function. The geometric shape of petal was obtained from curved surface and concave-convex texture. The combination of some basic functions was applied to the color simulation of the petal. The results show that the various plant petal modes can be designed quickly using the method, the shape and color of the petal can vary continuously, and the growth model can be built easily.  