The supercontinum spectra generation in a polarization-maintained photonic crystal fiber(PCF) with hexahedron structure and SiO2 cure pumped by the Ti:sapphire femtosecond laser is studied theoretically and experimentally.The results show that when the pump power of the laser is low, the self-phase modulation, self-steeping and intrapulse Raman scattering obtained by the nonlinear Schrodinger equation, are in agreement with the experimental results.However, when the pump power is high, the cross phase modul...