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Nowadays, the test methods of digital metering system in smart substation are used to test and evaluate the performance of a single device, but these methods can only effectively guarantee the accuracy and reliability of the measurement results of a digital metering device in a single run, it does not completely reflect the performance when each device constitutes a complete system. This paper introduced the shortages of the existing test methods. A systemlevel test method of digital metering in smart substation was proposed, and the feasibility of the method was proved by the actual test. [ABSTRACT FROM AUTHOR]