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Recently,the coexistence of ferromagnetism and superconductivity in ferromagnetic superconductors has attracted a lot of experimental and theoretical interests.Among these studies,the crucial theoretical work is to understanding the interplay between ferromagnetism and superconductivity.A one-band model was first proposed which assume that the itinerant electrons involved in both the ferromagnetic (FM) and superconducting (SC) states are within the same band [1-2].