Abstract: In order to study the relationship between the microstructure, performance and temperature field of laser cladding Ti/h-BN coating, a numerical model of the temperature field of laser cladding Ti/h-BN coating on TA2 substrate was established. The temperature field of single laser cladding was analyzed, and the experimental verification was completed using YLS-2000 fiber laser. The microstructure was analyzed by ultra depth of field microscope. The results show that the simulated melt pool is very similar to the results obtained by esperiment, and it can reflect the temperature field distribution during the laser cladding process well.In the process of rapid melting and solidification of laser cladding, it is easy to obtain a cladding layer with relatively dense microstructure due to the large temperature gradient and solidification rate; as the grains approach the surface of the cladding layer, they become finer. Since the microstructure distribution of the cladding layer is relatively uniform, the hardness of the cladding layer is improved with a small fluctuation, which is approximately 3.5 times than that of the base material.