Abstract: The laser deposition tests of TC4 alloy powder were carried out by using single factor control variable method under different laser powers, scanning speeds, powder feeding speeds and single layer uplifts.Taking the mass of forming zone, the ratio of the forming zone's height to the warping deformation as the evaluation basis of forming efficiency and forming accuracy respectively, the effect of various factors on deposition forming efficiency and precision of titanium alloy was analyzed.The results show that the bigger the mass of the forming zone, the higher the forming efficiency, and the bigger the ratio of the forming zone's height to the warping deformation, the higher the forming accuracy.With the increase of laser power, the mass of forming zone increases and the precision decreases; with the increase of lifting amount, the mass of forming zone increases first and then decreases, and the forming precision decreases first and then increases; with the increase of scanning speed, the forming efficiency decreases and the precision becomes worse; with the increase of powder feeding speed, the forming efficiency increases and the precision bocomes higher.When the laser power is 3000 W, the single layer lift amount is 0.6 mm, the scanning speed is 6-10 mm/s and the powder feeding speed is 1.2-1.8 g/min, the forming efficiency and the precision are optimal.