This paper is focused on the research of the 316 L stainless steel prepared by laser direct deposition, especially on the influence of laser power on the microstructure and properties of the parts by laser direct deposition. The results show that the obtained microstructure of the thin wall of stainless steel is composed of dendrites with the condition of the laser power less than 900 W, however, when the laser power reached to 1150 W, the dendrites become shorter. The mechanical property testing indicates that the as-formed 316L stainless steel under different laser power can meet the need to actual utility.