According to the real situation of over-error approved work of mass smart meters in city grid, which is time-consuming and less defects well-directed, this paper introduce an online platform development and evaluation indexes of state inspection for smart meters, which can provide a strong basic for the maintenance and operation of smart meters. Firstly, it analysis the influencing factors of state inspection of smart meter, and elaborates the evaluation indexes of state inspection of smart meters. Secondly, the online inspection and evaluation system is discussed from the second aspects of system architecture and business flow. Finally, a case of Tianjin City verifies the applicability of the evaluation indexes and online system, in order to provide a certain reference for the lean operation and maintenance of smart meters.