This paper describes super-continuum generation of femtosecond lasers(800 nm, 1kHz, peak intensity 1012 W/cm2) with PMMA polymers.The white light filaments changed from super continuum to pumped light spectrum is founded , the circle structures of the variable spectrum are recorded. The effect of interaction time on the filaments is presented.The relationship between the damage threshold of the PMMA and interaction time is investigated,The experimental results show that PMMA has the photorefractive properties in the field of super-continuum generation.