In order to ensure accuracy and reliability of test data and keep measuring equipment at the state of meeting required expectation, we should shorten the time misalignment after retroactive to minimize the risk and cost. This paper proposes the necessity, major objectives, common verification methods, and the handling of results of period verification.%为了保证检测数据的准确和可靠，使测量设备处于满足预期使用要求的状态，缩短失准后的追溯时间，尽可能降低风险和成本。文章提出了期间核查的必要性，主要对象，归纳了一些常见核查方法及结果的处理。
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