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The flux-cored wires were prepared by changing the contents of RE elements from 0 to 1%in the cored components,respectively,which were designed for the gas-shielded welding of 10CrNi3MoV high strength steel.The welding joints were prepared by the as-prepared flux-cored wires using the FCAW method in the M21 mixed gas protection environment.The chemical compositions of the welded metals from the joints were tested by ICP.The fracture appearance of the impact and tensile samples and the microstructure morphologies of welded metals were observed by the scanning electron microscope(SEM),respectively.