The welding deformation trend of one kind of complex hollow annular component used in a domestic nuclear power plant is analyzed. Combining with structural characteristics of components and determining reasonable size of the parts manufacturing, the component is reliably rigidly fixed by using simple and effective tooling. A welding method with low heat input and high deposition efficiency is used,which is suitable for all-position welding. The work sequence is assembling the parts as a whole firstly to increase the overall rigidity of the component and then performing welding. Measures such as zonal welding,central symmetry welding and skip welding are adopted for reducing the heat concentration and welding deformation, so that the welding deformation of the component is controlled within a reasonable range and the dimensional accuracy of the component is ensured. The successful manufacturing of the component could serve as basis for simplifying the manufacturing process and provide a reference for manufacturing of similar components.