Abstract: The finite element model is built for laser deposition repair process based on comprehensive consideration of the heat source model, heat transfer of convection and radiation, phase change latent heat and nonlinear factors of material. Then a numerical simulation of temperature field of multi-pass and multi-layer laser deposition repair is conducted using ANSYS parametric design language. The distribution of transient temperature field are studied at different time, and change of temperature and the distribution of temperature gradient of different nodes along center height of the repaired parts are analyzed. A temperature measurement system of laser deposition repair is established to test surface temperature of the repaired parts, and a good agreement is observed between the calculated temperature and the experimental results. It is found that thermal simulation of laser deposition repair is an effective way to control the microstructure of laser deposition repaired parts and improve the quality of repair.