Based on the tight-binding theory,the generation and split mechanism of one-dimensional multiple mirror photonic crystal defect modes were analyzed theoretically,and the relationship between defect mode frequencies and the relative location of defect layers was established. The transfer matrix method is used to analyze the optical transmission properties of the dual mirror photonic crystal,at the same time,the influences on defect mode properties by periodical layer number,incident angle,dielectric layer thickness and relative refractive index difference of photonic crystal are discussed.The simulation results show that adjusting parameters and defect layer relative locations of photonic crystal can control defect mode properties effectively,which can provide certain theoretical references for the design and application of photonic crystal multi-channel filters.