Abstract: A new ship wake CFAR detection algorithm is proposed in SAR images. The algorithm first detects all the ships and replaces the pixels gray value of the detected ship with the gray mean value; Then, with the ship barycenter as the center, a square image with a certain length is got and the image is segmented into four sub-images and to perform Normalized Hough Transform on every sub-image; The gray contrast of wake to clutter in the sub-image is enhanced. The probability model in the transform domain of each sub-image is constructed to realize CFAR detection; Finally, the detection results of the sub-images are fused to get the final detection. The detecting results are much better and can be used for CFAR detection. The simulation experiment proves the effectiveness of the algorithm.