A high symmetry of the mode field distribution and high birefringent photonic crystal fiber (PCF) is presented, with uniform size of ellipse air holes arranging like diamond. A full-vector finite element method is used to simulate the fundamental mode field distribution, effective mode area, birefringence and dispersion. Circle air-holes PCF with the same parameters are also computed to compare with it. Both of the fibers have high symmetry mode field and nearly circular, which makes it couple with other fibers in optical devices easily. It achieves high birefringence of elliptical air-holes PCF up to 10-3.