Abstract: Experiments are carried out for the welding of FH40 steel + 317L stainless steel clad plates through the selection of welding materials and the design of welding procedure. The microstructures of the joints and the morphologies of the impact fractures are analyzed. It shows that the welding procedure could be divided into three sections, including base layer welding, transition layer welding and clad layer welding. The welding joint performs a good mechanical property matching with the base metal. The impact results of the different places from the clad side are basically the same. The impact fracture at -60℃ presents a ductile fracture morphology, and no martensite microstructure occurs in the transition layer.