The invention discloses a realization method based on a bayesian non-local mean filter, belonging to the field of image processing technology and mainly overcoming the contradiction problem of detailmaintenance and smooth degree in the prior spot removing result of SAR images. The realization process comprises the following steps: (1) calculating the distance between a pixel and all of the pixelsin a search area according to a distance formula for the pixel of the input SAR image; (2) calculating the weight of all of the pixels in the search area by using a weight calculating formula according to the calculated distance of all of the pixels; (3) carrying out weighted average on all of the pixels in the search area to obtain a recovery value of the pixel according to the calculated weightof all of the pixels in the search area; and (4) calculating the recovery value of each pixel according to the steps to obtain a spot removing image. Compared with other classical sport removing methods, the invention can better smooth spots and noise, maintain edge and texture details of the SAR image, and can be used for spot removing processing of the SAR images.