The self-cleaning technology for solar cell array can promote efficiency of electricity produced and protect the solar cell. In this paper, a method of dusts-removal based on travelling-wave dielectrophoretic force was proposed. The theory of travelling-wave dielectrophoresis and the adhesion model between the dusts and the surface of the solar cell array were analyzed. According to the theory and the fabricating process of the film, the structure of the self-cleaning film for large solar cell array was designed.