In order to solve the problems of low sensitivity, high loss and difficult control of nonlinear effect of traditional fiber, a novel elliptical core like photonic crystal fiber(PCF) structure with high birefringence, low loss and high nonlinearity is designed. Based on the full vector finite element method, the effects of the size and position of the air hole on the birefringence, confinement loss, mode field characteristics and nonlinearity of the fiber end face are analyzed by COMSOL. The simulation results show that the birefringence index of the PCF is 1.918×10-3 at the wavelength of 1.550 μm, the limiting loss of x and y polarization direction is Lcx=1.6×10-3 dB/km and Lcy=8.0×10-4 dB/km respectively, the nonlinear coefficient is 9.4 km-1W-1, and the single-mode transmission is satisfied. The high-quality and high-precision optical signal transmission and sensing are realized.