Through the number calculation and the theories analysis that designs oping onedimensional photonic crystal, the characteristic of TM wave and TE wave defect mode resulting from incident argle and the characteristic of TM wave defect mode resulting from thickness of defect were gotten.The defect mode of TM wave have been in the incident angle 0~π/2, the defect mode of TE wave have been in 0~0.65rad. The defect mode of TM wave with thickness of defect look like to present line variety within the scope of certain wavelength. Design a tunable filter scope with adjustable wavelength is 290 nm, the adjustable scope of the FWHM is in 1.5~3nm, the transmissivity of the polarization tunable filter is more than 0.98.