Abstract: Aiming at the shortcoming of the current sampling inspection system in distribution network that it is inconsistent in strictness with various product batch sizes, an adjusting sampling plan for key materials of distribution network is proposed, which is based on the commonly used MIL–STD-1916 sampling standard. The proposed sampling plan combines with the actual sampling inspection of power grid, meets the requirements of four "one hundred percent" and (n|0) rules in inspection documents of power grid, and does not increase the current workload of sampling inspection. The research results can be applied to the sampling inspection for procurement of distribution network materials in power grid.