In terms of the difficulties to match between infrared and visible images of electrical equipment in the same scene,a registration method based on slope consistency is proposed．Firstly,the edges of infrared and visible images are extracted by the edge detection algorit hm mathematical morphology based on the multi-directional structure elements and different weights,and the rough e dges are obtained．Then,the feature points of two edge images obtained by the above method are detected respectively by speeded up robust features (SUR F) algorithm,and the feature points are matched by the prior knowledge of the s lope consistency between the correct matching points．Finally,affine transformation parameters are obtained by a least-squar es solution,and the registration between the infrared and visible image is achieved by using these p arameters．Experimental results show that the proposed method can effectively improve the accuracy of ma tching points and make the location of the feature points be more precise,which can achieve high pr ecision in the registration of infrared and visible images of electrical equipme nt．