The titanized layer was prepared on the surface of T10 steel using a double glow plasma surface alloying (DGPSA) technique. The titanized layer was characterized by SEM and scratch tester. Results showed that the TiC layer with a thickness of 1.5~8.5μm was formed on the sample surface at the range of 900°C to 1100°C for the holding time from 2h to 6h, which was homogeneous, dense, and metallurgically combined with the substrate. The Ti concentration gradually decreased from surface to the matrix. The diffusion activation energy of Ti during double glow plasma titanizing was also estimated.