中文摘要：

文章以历史学为研究对象，通过分类号获取CNKI中相关文献数据，计算了历史学各子学科在2008~2012年间的学科引用半衰期与学科被引半衰期。结论是：从学科引用半衰期来看，历史学引用半衰期较长，引用多为历史经典文献；从被引半衰期来看，其半衰期较长，表明历史学研究的老化速度慢，且对其他学科有较高的借鉴价值。

英文摘要：

This paper calculates the discipline half-life （citing half-life and cited half-life） of history studies based on CNKI data. On the basis of discipline citing half-life, it is clear that history studies do not care much about the time of documents and old classic documents are treasured. On the basis of discipline cited half-life, it is clear that the obsolescence of history is long because the history studies have great impact on studies of other social science.