The mode field of photonic crystal fiber structured with hexagon symmetry hole cladding was analyzed by multipole method, and the effective indexes of base mode of different wave length were got. The characteristics of this photonic crystal fiber grating were computed and simulated by coupled-mode method and transmission matrix method. Moreover, the differences were compared between conventional fiber grating and photonic crystal fiber grating on their reflection spectrum and delay. The apodization characters of this fiber grating were also researched to get optimal apodization function and corresponding transmission spectra. Compared with the conventional fiber grating, it is found that the refractive index of core mode declines as wavelength rising, and photonic crystal fiber grating show a clear blue shift. When chirp processed, 10 centimeter-long photonic crystal fiber grating can provide 1 200 ps linear delay.