Abstract: Introducing the process characteristics and failure types of continuous casting rolls for slab, the requirement for performance of continuous casting roll and current research on overlaying welding materials are described. A new overlaying welding rod for continuous casing rolls was then developed by adding some functional alloying elements into the 1Cr13NiMo series martensite corrosion-resistant steel as basic welding flux, as well as the sintered flux to match it. With the newly developed welding materials used, the structure, strength and thermal fatigue resistance of the weld zone are all better than those of imported rolls. How the different interlayer temperatures during overlaying welding and heat treatment temperature after welding affect the weld zone were both investigated, and the results showed that the most favorable structure and mechanical properties are available if both are chosen appropriately. The service life the continuous casting rolls thus welded is proved longer than imported ones.