Abstract: The micrographs of cross-section of multi-pass single-layer weld-based remanufacturing component are analyzed,especially the microstructure of filler pass in middle position.The microhardness of multi-pass single-layer remanufacturing component at the whole cross-section and the inter-pass position is tested,and tensile testes in different directions are carried out.Research results show that every pass of cladding except for the last pass contains the remelting region,half melting region,complete phase transformation region and segmental phase transformation region.On the across section,the micro hardness of remanufacturing cladding at two sides is larger than that in the middle position.The allowed tensile loads of test piece along depositing direction are larger than those along vertical depositing direction,and the fracture types of tensile pieces at two situations are both plastic fracture.