Ultrasonic assisted laser cladding technology is developed on the basis of laser cladding technology, and the technology that ultrasonic is introduced to laser cladding can improve the quality of the cladding layer. The laser cladding experiment is done by adding ultrasound vibration with a frequency of 19.56 kHz on titanium alloy matrix of BT20. Based on the experiment the effects of ultrasound on the laser cladding process is studied. The results show that, under the condition of using 2.2 W ultrasonic vibration, the surface flatness of the cladding layer is good, the porosity rate of internal organization is dropped to 0.75%, the grain size is decreased by about 42%, the α-sheet length is decreased by 23.9%, but the stacking efficiency in the direction of deposition and growth is reduced by 36.7%.