The work aims to propose a standardization proposal, in view of the fact that there are no corresponding national standards for the microbiological indexes and testing methods of metal package for milk powder at present. The present situation of the microbiological indexes standardization of infant formula and food contact materials or products was analyzed. Based on the framework of the current Food Safety Law and the national food safety standards, the feasibility of microbiological indexes standardization of metal package for milk powder was explored from such three aspects as limit indexes, sampling method and testing method. The standardization proposal took into account the characteristics of the interior and packaging materials, and was proved to be operational for the test of microbiological indexes of metal package for milk powder through the laboratory's preliminary verification test. The proposal meets the characteristics of metal package on the indexes, and the sampling and testing methods refer to the standards of similar products. The overall feasibility of the proposal needs further evaluation and confirmation by the vast market and relevant departments.