Abstract: In order to solve the problems of the sharp increase in the number of secondary circuits of metering at the gate, the heavy on-site inspection tasks, the long time interval, and the inability to dynamically grasp the intermediate state, based on the subjective and objective comprehensive evaluation method and analytic hierarchy process, the state evaluation of the secondary circuit and the prediction trend of the secondary circuit were proposed, and the fault of the secondary circuit was found, and the state maintenance strategy was formulated accordingly. The results show that the trend prediction method based on the gray theory is correct and feasible, which provides a theoretical basis and guidance for the state assessment and health prediction of the gateway measurement points.