Abstract: It is difficult to render the shape of natural wheat lamina in virtual scenes because of its complex and irregular structure. A new image-based 3D reconstruction method, which concentrates on lamina edges, growing curves and the phenomena of lamina twisting and wrapping effect, has been put forward. This method was implemented by employing the edge detection method to extract wheat lamina edge data and mapping the 2D edge data to 3D space according to a wheat curve function. Furthermore, an unrestricted lamina model and a restricted lamina twisting and wrapping model were constructed based on the method. The results show that the new method is convenient for keeping the natural shape of lamina and implementing the Level-of-Detail model, and works well on simulating twisting and wrapping effect of wheat lamina.