：文章以布里渊指数（BI）和Hill型测度（HI）作为测度指标，对ESI数据库2017-2018年物理和化学两个学科的热点论文的跨学科性进行了分析。研究结果表明物理和化学学科热点论文的BI值和HI值均不大，BI值小于2,HI值小于9。化学学科热点论文的跨学科性测度值略高于物理学学科，物理和化学学科领域内的热点论文都引用了除自身学科领域外的其他至少一个学科的文献，大部分论文的参考文献所跨学科数目在6-10个之间。

Two indicators, Brillouin's index (BI) and Hill-type index(HI), are applied to measure interdisciplinarity. Based on the data from the ESI database 2017-2018, the research reveals that the BI and HI values of hot papers in physics and chemistry are not very high, with BI<2 and HI<9. The interdisciplinarity of hot papers in chemistry is slightly higher than that in physics. Both hot papers in physics and chemistry cite papers from at least one subject other than their own subject areas. Most of the hot papers have a cross-disciplinary number of 6-10 in their references.