A novel high birefringence photonic crystal fiber (PCF) was proposed, which consists of hexagonal inner ring and octagonal outer ring. A full vector finite element was applied to investigate the mode birefringence and chromatic dispersion. It has been demonstrated from the calculated results that high birefringence to the order of 0.001 can be achieved and ultra-flattened dispersion of -0.8~+0.2 ps/(km•nm) is obtained in 1.5 to 1.65μm wavelength range.