To repair the titanium alloy thin-wall parts by laser cladding and obtain high quality laser cladding coating on the surface of titanium alloy,three-dimensional model of temperature field for synchronous powder feeding laser cladding was established and simulated by ANSYS software,and the distribution of temperature field and process parameters were analyzed in the process of laser cladding. The results show that the front temperature field has the characteristics of low cladding temperature,intensive isotherm and large temperature gradient along laser scanning direction,compared with the latter temperature field. After cladding two cladding channels,cladding channel No.1 hasn′t been remelted and also has a preheating effect on cladding channel No.2. Laser processing has the remarkable characteristics of rapid heating and cooling,and the cooling rate reaches during cooling. Under the invariability of other process parameters,when laser power is 1100 W,scanning speed is 4 mm/s,spot diameter is 1mm,the simulation process gets a good metallurgical bond theoretically. This study provides a reference and guidance for the repair of thin-wall parts.