This paper reports the generation of super-continuum spectra in the photonic crystal fibers with a symmetric and asymmetric structure and ultra-broaden spectra covered from UV to infrared were obtained in both nbers. Especially, the generation of third harmonic wave was observed with the asymmetric photonic crystal fiber, the polarization effects of super-continuum spectra were also studied Using the polarization effect, it will enable us to control the distribution and relative intensities of super-continuum components, which is very beneficial in many applications.