本文报告了内蒙古黄鼠鼠疫自然疫源地１９８１～１９９８ 年黄鼠寄生蚤指数与黄鼠鼠疫动物病的关系。黄鼠体蚤指数小于等于１．４０ 时的年份，未发现鼠疫动物病流行；黄鼠体蚤指数大于等于１．６７ 时的年份，发生频率高达９３．３３％ 。因此，黄鼠体蚤指数的高低与否是影响动物鼠疫流行的主要因素之一 The paper reports the relationship between the parasitoid flea index and zoonotic plague zoonosis in the natural foci of Inner Mongolian plague from 1981 to 1998. There was no epidemic of plague animals in the year when the body flea index of the body was less than or equal to 1.40. The frequency of occurrence of body flea index of the body when the body was greater than or equal to 1.67 was 93.33%. Therefore, the level of the rat’s flea index is one of the main factors affecting the epidemic of animal plague