There are various proposed methods and purposes of laser surface modification, and intensive researches and developments are now conducted worldwide. They can be classified into two basic types. One is to change the physical and chemical properties of bulk surface and its vicinity, and the other is to give a film or layer having special functions onto the surface. Both will be achieved by the physical and chemical processes based on different mechanisms. In this paper will be only described on the laser surface modification of metal associated by the rapid cooling or solidification processes in which metastable structures having special properties are effectively formed.