Apparently, whether local time scale runs good depends on how it is close to international standard time UTC, but it is more important that the consistency of the second definition reproduced by local time scale and by standard time UTC. Based on the concept defined by BIPM about International Atomic Time (TAI) and Coordinated Universal Time (UTC) , it is proposed that fractional frequency difference and time stability are the technical criteria to evaluate the local time scale. The argument above is proved by data analysis from six worldwide timekeeping laboratories with fractional frequency difference and time stability, and then this dissertation give some specific analysis about the relationship between each laboratory' s time scale generation program and the two indexes.%本地时标UTC(k)运行好坏取决于其与国际标准时间UTC的靠近程度,实际上,本地时标所复现的秒定义与UTC所复现的秒定义之间的一致程度应是更重要的衡量指标.根据国际计量局关于国际标准时间TAI和UTC的定义,提出了相对频率偏差(频率准确度)和时间稳定度是评价本地时标优劣的技术指标.通过对国内外6个守时实验室相对频率偏差、时间稳定度两项指标分析证明了上述观点,并对各实验室时标实现方案进行了简要评述.
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