Laser melting deposition(LMD)is an advanced metal additive manufacturing technology,which has the characteristics of high molding speed,mold free manufacturing,multi axis operating system and effective recycling of excess powder.However,the deposition process can lead to poor forming quality,resulting in reduced densities and fatigue properties of LMD parts.In order to improve the density and fatigue properties of 316L austenitic stainless steel LMD parts,an experimental study is carried out to analyze the effects of different process parameters on the geometric characteristics of single track deposition process of LMD.In this paper,316L austenitic stainless steel powder is used to carry out corresponding process research on LMD equipment and the effect of laser power and scanning speed on the geometric characteristics of single track deposition is explored.A regression model is established through regression analysis of process parameters and geometric characteristics,and the effect law of process parameters on geometric characteristics is established.This work provides the basis and parameter guidance for the subsequent preparation of fatigue test specimens for 316L LMD parts.