In recent years, we have systematically studied amorphous layer formation of III-V semi-conductor compounds irradiated by pulsed laser light. In this paper the study on the phase transition of semiconductor compounds and multicomponent alloys was reported. The optical properties of materials during phase transition were measured. The surface morphology,transition temperature and laser threshold power were also determined. A dynamic model for surface cooling and phase transition was proposed. The stability of amorphous layer were investigated in detail. The possibility of using these materials for reversible optical disc was discussed.