Abstract: The nano-composite Ti(C,N)-based cermets were produced by vacuum pre-sintering and post-hot isostatic pressing technology.The influence of pre-sintering temperature on the microstructure and properties of nano-composite Ti(C,N)-based cermets has been studied using SEM,TEM and EDX.With the increase of pre-sintering temperature,the grains were spheroidized gradually and distributed evenly,the size of grains decreased,the small grains with inner-rim and outer-rim and white core-gray hull increased greatly and the rim phase was complete.For the nano-composite cermets sintered at 1 420 ℃,it could acquire satisfied microstructure and good properties.When the pre-sintering temperature increased further,the crystalline began to grow,the rim phase became wider and the properties of cermets decreased.The optimal pre-sintering temperature of nano-composite Ti(C,N)-based cermets was 1 420 ℃.