the results of laser cladding process depend on tempera-ture distribution, thermal stress fields and geometrical deformationduring the manufacturing process, study of these results is vital. Bysimulation of the process, the thermal characteristics during man-ufacturing three-layer process using Nd: YAG laser and materials;IN-738 for substrate and NiCoCrAlY for powder were studied.The results show that by increasing clad height, the maximumtemperature increases and the melt pool can be larger, therefore thepowder efficiency and height of the next clad increase. The numeri-cal results show that adding 2% nano-CeO2and pre-heating reducethe ratio of the maximum thermal stress to the maximum temper-ature and hence prevent to formation of cracks and delaminationin clads.