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本文对安徽省安庆市一个水上村及天长县北荡村渔民的近亲结婚情况进行了调查。结果发现近亲结婚率及平均近交系数水上村分别为６．５５％及０．００４０１，北荡村分别为７．６９％及０．０００８７；近亲结婚者子代２０岁前死亡率为２２．５％，与对照组（９．０１％）比较，差异有显著意义（Ｐ＜０．０１）。本调查表明，除了风俗习惯及地理环境隔离造成近亲结婚外，还存在着职业条件造成的近亲结婚。
This article investigates the close relatives’ marriages of a water village in Anqing City, Anhui Province and fishermen in Beidang Village, Tianchang County. The results showed that the rate of inbreeding and the average inbreeding coefficient were 6.55% and 0.00401 respectively in Beishundang village and 7.69% and 0.00087 in Beidang village respectively. The death rate of offspring of marry offspring before the age of 20 was 22. 5%, compared with the control group (9.01%), the difference was significant (P <0.01). The survey shows that in addition to customs and geographical isolation caused by the marriage of close relatives, there are still occupational conditions caused by the marriage of close relatives.