In order to standard different parameters in the laser direct metal deposition (LDMD) formation technology, the experiment of LDMD formation of Inconel 625 spherical alloy powders and the nondimensionalization of the formation parameters are conducted, and the working diagram with the contact angle as an evaluation parameter of geometric morphology is obtained. The relationship between the geometric morphology of single track deposited layer and the process parameters is discussed. The results show that, when the ratio of characteristic energy is between 0.5 and 0.7, the deposited layer shows a relatively smooth oval because of incomplete melting of powder and less energy redundancy. Feeding rate is the primary factor to control the height of deposited layers. When the feeding rate is constant, the laser power has a great influence on the depth of molten pools.