36 cases of crystal hyaline corex emulsification operations for immature cataract with YAG laser are reported in this peper. According to the basic theory of intetaction between laser and tissues, the mechanism of laser induced hyaline cortex emulaification in the operation is discussed, and it is put forward that the mechanical effect of laser plasma shock wave and Photochemical effect of plasma flailing on eye tissues result in the crystal hyaline conex tissue protein degeneration and coagulation.