The method about detection of rim thickness parameter based on dual camera is proposed. Image registration is an important factor affecting the parameter calculation. Based on analyzing the characteristics of images of wheel contour, an image registration method is proposed, which relies on the feature point on registration plate. The image registration steps are designed. The affine transformation model is determined. The registration plate is designed for the consideration of the distribution and the number of feature points on the registration plate. The accuracy can be guaranteed. Through the experiment of image registration, the coordinates of feature points is extracted. The affine transformation matrix is solved. In the experiment, the accuracy is 2 pixels.