The design and simulation of polarization beam splitter(PBS) for Y type two-dimensional photonic crystal with the same beam splitting radius are presented. It is based on the different properties of the light waves with different polarization modes propagating in the two-dimensional photonic crystal. The function of the PBS were numerically simulated and analyzed using the finite difference time domain ( FDTD) method. It is shown that parallel splitting with high efficiency for TE and TM modes can be achieved. The transmission probability can reach over 97% for TE mode and over 93.5% for TM mode for a Gaussian pulse light with a wavelength of 1.55 μm. The size of the splitter is only 6.3 μm × 6.8 μm. Owing to these excellent features，the PBS is a promising candidate in the future photonic integrated circuits.