Abstract：Surface fractal dimension was employed to describe the topography of flaky powder. DBC algorithm was chosen here to calculate the surface fractal dimension. With this algorithm computer program were tested for six kinds of flaky powder images that were obtained through microscope by digital camera under same resolution. It was found that the values of surface fractal dimension ranged from 2 to 3 and increased with the ruggedness of powder. The tiny pits or ruffles on powder surface made great contribution to the value as fractal dimension. The results obtained show that the surface fractal dimension reflects to some degree the surface roughness. It is valuable to apply the surface fractal dimension to the preparation and application of flaky powder as a description of surface roughness.