Abstract: Nuclear power plant decommissioning will produce large amounts of metal wastes, and the disposal of the parts with radioactive contamination should follow the appropriate classification and processing guidelines. Based on the analysis of international and domestic standards, this paper puts forward the feasible classification and treatment plan, focusing on the restricted use of low-polluting metal waste. The practical application in a nuclear power plant decommissioning project verified that it can minimize the wastes and reduce the cost of disposal.