By analyzing the effect of laser in transparent media, the femtosecond laser pulses transmitting through transparent media can produce many nonlinear effects, which greatly expands the laser pulse frequency spectrum and produce the white light radiation. The spectrum characteristic of white light radiation and cone angle radiation are discussed. The above analysis and discussion of experiments show that the white light spot appears on the receiving screen, and white light spectrum covers from visible to near infrared bands with good coherence, when laser power reaches a certain value and laser transmits through the solid transparent media, such as quartz glass.