The filtering characteristic of the one-dimensional photonic crystal structure composed of Ag-ITO thin films in the spectral range of 300-800 nm is investigated by the finite difference time domain method. The influences of metal defect layer thickness, incident angle, and ITO film thickness on filtering characteristics of photonic crystals are simulated. The dispersion relationships of the photonic crystal under different parameters are simulated and calculated, and the corresponding mechanisms are analyzed. The results indicate that, the filtering range and filtering waveform of the photonic crystal can be modulated by tuning defect layer thickness. The change of the incident light in the small angle range (0°-20°) has little influence on the filtering performance of the photonic crystal. With the increase of ITO film thickness, the filtering spectrum shows a periodic change.