The laser additive TA15 powder test was carried out on TC6,the tensile strength of samples was measured after additive repair with WDW-100 testing machine,the impact toughness of the repaired sample was measured with an impact toughness testing machine. The optical microscope（OM） and scanning electron microscope（SEM） were used to observe and analyze the microstructure of the joints. Research indicates that the TC6 damaged laser additive repair joint is well formed,and there are no cracks or pores at the joint interface joint. The tensile strength of the joint can reach 1 000 MPa,the impact toughness can reach 27.5 J/cm,2,and the specimen breaks in the heat affected zone near the TC6 base metal. The best process parameters of TC6 laser deposition were that the laser deposition powder was TA15 powder,the laser power was 1 400 W,the scanning speed was 0.01 m/s,the powder feeder reading was low%（English）,the powder carrier gas was 8 L/min,the overlap rate was 40%,the spot diameter was 2 mm,the height of single cladding layer 0.3 mm. The TC6 laser deposition joint consists of weld zone,fusion zone,heat affected zone,and base metal. The weld zone was mainly fine acicular martensite;the semi-melted grains in the fusion zone were mainly β columnar crystals grown by substrate epitaxy;and the fusion zone was composed of coarse columnar crystals,the crystal grains grew in a upside down V shape;the heat-affected zone was mainly α’ lamellar martensite.