To further improve the optical fiber transmission property,this paper proposes two kinds of photonic crystal fibers with high birefringence and constructs the model of the fiber.The finite element method is used to numerically calculate the fiber mode l and the influence of fiber structure parameters on transmission properties such as dispe rsion, birefringence,confinement loss and nonlinear coefficient of fundamental mode ar e studied. The study shows that the two kinds of photonic crystal fibers designed in this p aper can obtain birefringence up to 3.676×10－2 and 4.477×10－2 respectivel y,the confinement loss of both types of fibers is kept at the order of magnitude of 10－8 dB/m or below,a nd both have low nonlinear coefficients at the wavelength of 1550nm.There fore,the optimization of optical fiber transmission property makes it more beneficial to the stable trans mission of optical signals over long distances,and can be applied to high-speed optical communication,optical fiber sensing,dispersion compensation and other f ields.