Abstract: A high birefringence and high negative dispersion photonic crystal fiber (PCF) was investigated, which adopted both squeezed triangular lattice and two kinds of elliptical air holes in the cladding. The supercell lattice method was used to investigate the influence of the fiber parameters on the birefringence and dispersion properties. The simulation results show that the birefringence can reach the magnitude of 10-2 in a broad range of wavelengths from 1.1 m to 1.9 m, and the dispersion can achieve high negative dispersion in a broad range of wavelengths form 1.4 m to 1.8 m. This PCF also has high birefringence (3.410-2 at 1.55 m), high negative dispersion (-428.2 ps/(nmkm)and -126.9 ps/(nmkm) and in y- and x- polarizations at 1.55 m, respectively). Moreover, the effective area was also discussed. This PCF can be widely used as dispersion compensation PCF and polarization dependent communication system.