在自然科学领域中,常有不少现象是以方向或时间来度量的,如心电向量图的电轴,脑血流图的上升角、疾病的发病时间、人口出生、死亡时间等。这些量的特点是有周期性,常常周而复始,无真正的零点,可以任意定质,对于这一类数据,常用圆形分布法来研究其分布规律。佳木斯地处三江平原,是我国流行性出血热重点疫区,历年发病率、死亡率均较高,进入80年代曾有两次暴发流行。本文应用圆形分布法对佳木斯市1980～1990年流行性出血热资料进行分析,以探讨其季节性流行特征,为防治工作提供科学依据。 In the field of natural science, there are often many phenomena that are measured by direction or time, such as the electrical axis of the ECG vector chart, the rise angle of the cerebral blood flow diagram, the onset time of the disease, the birth and death time of the population. The characteristics of these quantities are periodic, often repeated, no real zero, can be arbitrary qualitative, for this type of data, the circular distribution method is often used to study its distribution. Located in the Sanjiang Plain, Jiamusi is a key epidemic area of ​​epidemic hemorrhagic fever in China. The incidence and mortality rate of Jiamusi are both high and there were two outbreaks in the 1980s. In this paper, circular distribution method was used to analyze the epidemic data of epidemic hemorrhagic fever in Jiamusi City from 1980 to 1990 to explore its seasonal epidemic characteristics and provide a scientific basis for prevention and control work.