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为阐明龙泉市流行性出血热（ＥＨＦ）发病的时间分布规律，应用圆形分布法及直线相关法对该市１９７４～１９９５年ＥＨＦ疫情资料进行分析研究。结果表明：龙泉市ＥＨＦ出现发病率高峰周期为５～６年；年发病具有季节性（冬季）升高特征；年发病高峰日各年均集中落在１１～１月三个月份，２２年总的高峰日在１２月１６日；高峰季节发病占４５％；季节性指数为５．５８。结论提示：年发病率高低影响季节性强弱；流行强度变化对发病高峰日早晚也有影响。该文还对流行年度的划分等有关问题作了讨论。
To clarify the time distribution of epidemic hemorrhagic fever (EHF) in Longquan City, epidemic data of EHF from 1974 to 1995 in the city were analyzed by circular distribution method and linear correlation method. The results showed that the peak period of occurrence of EHF in Longquan City was 5-6 years. The annual incidence of EHF was seasonal (winter). The annual incidence of EHF was concentrated in the three months from January to January, Peak on December 16; peak season incidence of 45%; the seasonal index of 5.58. Conclusions: The incidence of seasonal changes affect the seasonal strength; changes in prevalence intensity on the peak morning and evening also have an impact. The article also discussed the related issues such as the division of the popular year.