In this paper, the power failure of smart meter is widely appearing in domestic. Some targeted research and test is done for smart meters which are manufactured out of factory. Battery power loss is considered as a break point for research and the actual and effective data can be obtained through certain detection methods. Scientific analysis is described according to the test results. In this paper, the cause of power failure of smart meter is found and two improvement measures are suggested following objective conditions in order to eliminate extension of power failure of smart meter.