Abstract: The transfer matrix method was used to simulate the transmission characteristics of 1-D photonic crystal.Furthermore,it was also studied how the defect layer thickness affects the defect mode polarization properties.The results shew that the variance of incident angle had significant influence on the forbidden band and defect mode of 1-D photonic crystal,both of which shifted in the direction of high frequency(low wavelength) with the incident angle increasing.The forbidden band width of s polarization increased gradually but that of p polarization changed little.The defect mode frequency of p polarization shifted a little more than that of s polarization.When the incident angle increased,the defect mode of s polarization became narrow more and more and its quality factor increases gradually,nevertheless,the defect mode of p polarization changes the other way round.