In this paper, we proposed a dual-enhanced core photonic crystal fiber (PCF) with high birefringence and ultra-high negative dispersion for dispersion compensation in a polarization maintained optical system. Using finite difference time domain (FDTD) method, we presented dispersion compensating PCF (DC-PCF) with negative dispersion between −1650psnm −1 km −1 and −2305psnm −1 km −1 in C-band and particularly −2108psnm −1 km −1 in λ=1.55μm wavelength. By this method, we can compensate dispersion in 124km long span of a conventional single mode fiber (SMF) by 1km-long of the DC-PCF at λ=1.55μm wavelength. Moreover, fundamental mode of the proposed PCF can induce birefringence about 3.5×10 −3 at 1.55μm wavelength.