Corner is a special edge point, which is the important geometrical features of digital image. This article uses the characteristic that edge is continual and proposes the algorithm based on the growth of the seed point SUSAN edge detection. It obtains the images of the corner points by using the Susan algorithm, and then gets the corner points as seed points, carries on the growth according to the criteria to determine the edge points. The paper realizes the edge detection finally. The experimental results based on this method was proved to be feasible.