Abstract: The influence mechanism of process regulation on the quality of the deposited layer of TA15 titanium alloy by laser melting deposition was investigated, and the geometrical appearance, overlap rate and dilution rate of the formed specimens were analyzed by OM microscope and finite element simulation. The results show that: when the powder feeding rate is gradually increased from 500, 600, 700 to 800 g/h, the layer thickness of the specimen gradually becomes larger, and the unmelted powders gradually appear in various places of the deposition channel; the finite element results show that laser power P and scanning speed v play an obvious role in the melting pool temperature, and the melting pool “tail dragging”changes dramatically when the laser power is increased, and the melting width change trend is in line with actual value, and the value is slightly larger than the measured value; in the multi-channel lap test, when the track spacing is reduced from 3.2 mm to 2.4 mm, the inter-channel collapse is flattened and gradually becomes protruding. During measuring of the dilution rate, it is found that the powder feeding rate mainly affects the layer thickness to change the dilution rate, while P and v mainly affect the melt depth. By summarizing the variation trend of deposition layer geometry, overlap rate and dilution rate with parameters, it is found that the deposition layer with the most stable printing quality can be obtained when 5000 W power,1200 mm/min scanning speed, 500 g/h powder feeding rate and 2.8 mm trajectory spacing are used.