Abstract: Using the characteristic of median filter and grey relevancy, an algorithm for mixed noise filtering is presented based on median filtering and grey relevancy.A median pixel is determined in the filter window, and the coefficient of the proposed method can be varied adaptively based on degree of the grey relevancy, then the values of the processed pixel can be calculated.Experiment results show that the proposed method can remove mixed Gaussian and impulse noise efficiently preserve the integrity of edge and detail information and remove mixed noise effectively.