The spectral property of the uniform fiber Bragg grating in the high-birefringence photonic crystal fiber are studied. By using the compact supercell method, the transmission property of photonic crystal fiber is analyzed, the coupling rule of forward and backward transmission modes is studied, and properties of uniform fiber Bragg grating written in photonic crystal fiber are concluded. The dependence of Bragg wavelength λB, defined as the resonant wavelength of the fiber Bragg grating in photonic crystal fiber with C6v symmetry, on the fiber structural parameters is expressed. The spectrum of the fiber Bragg grating inscribed in a high-birefringent photonic crystal fiber is analyzed and the peaks of reflectivity with different polarization states are much separated for the high birefringent index. Finally, the spectrum of a common fiber Bragg grating in a birefringent twomode photonic crystal fiber are obtained, in which peaks of reflectivity corresponding to two polarization states of modes LP01 and LPe11 are separated due to high birefringence of the photonic crystal fiber.