The analysis of texture direction feature of strip surface defects was reasonable or not affected the correctness of defect image recognition. To strip surface defects and texture direction feature abstraction which described defect image, the relationship between detection distance and detective direction angle and the basic methods of texture direction feature abstraction of defect image were given. Based on the case studies of crack defect image to strip surface with both noise and noise free, the texture feature should take the maximum value in texture direction and the minimum value in the direction perpendicular to the texture were proposed. The detection distance should be selected according to the specific situation, not too large or too small and the threshold value should be small when analysis defect image with noise.