The filtering characteristics of one-dimensional photonic crystal with an air defect layer were investigated using transfer matrix method as the thickness of defect,incident angle and thickness perturbation changing.The studies suggest:For air thickness adjustable structure,considering the dispersion of the materials,the increase of 2 nm for the air thickness makes the transmission peak shift about 2 nm to the long-wave direction,which shows a linear relationship of 1:1;For incident angle adjustable structure,compared with the normal incidence,when the incident angle change from 0° to 89°,the omnidirectional photonic bandgap decrease 105 nm (TE mode)、600 nm (TM mode) respectively;which shows that TM mode band gap are greatly influenced by the change of incident angle;it can realize the tunable filter in C band when the incident angle varies from 0° to 16.9° (TE mode) and 17.0° (TM mode) respectively.In the same period,the mutual remedying of thickness error of two materials can realize insensitivity to thickness perturbation in small range,which can narrow the deviation between the actual peaks and theoretical peaks to reduce the difficulty of the fabrication of photonic crystal.