目的　查明洞庭湖区牛群放牧行为的特点 ,为优化牛群血吸虫病化疗策略提供科学依据。方法　在洞庭湖区设 4个点分层观察距防洪大堤 5 km以内牛群的放牧时间、地点和方式 ,以及近 3年来化疗情况。结果　饲养户距堤 0 - 10 0 0 m、10 0 1- 2 0 0 0 m、2 0 0 1- 30 0 0 m、30 0 1- 40 0 0 m、40 0 1- 5 0 0 0 m 5层的牛群在外洲放牧的比例分别为 95 .35 %、78.0 5 %、10 .71%、0、0 ;放牧方式为敞放。5层平均化疗覆盖率分别为 85 .2 9%、5 6 .0 0 %、30 .13%、2 4.5 6 %、0。结论　洞庭湖区牛群在外洲放牧数量和时间与距堤远近有关 ,距堤越近 ,比例越大 ,距堤越远 ,比例越小 ,3km以外无牛在外洲放牧。牛群化疗应以是否在外洲有螺地带放牧为依据 Objective To find out the characteristics of herd grazing in Dongting Lake and provide a scientific basis for optimizing the chemotherapy strategy of herd schistosomiasis. Methods Four points were stratified in Dongting Lake area to observe the grazing time, location and method of herd within 5 km from the flood control embankment and the chemotherapy in recent 3 years. Results Feeding households were located at the bank of 0-10,000 m, 10 0 1-2 0 0 0 m, 2 0 0 1-30 0 0 m, 30 0 1- 40 0 ​​0 m, 40 0 ​​1- 5 0 0 0 m The proportion of herds grazing on the 5th floor in the continents were 95.35%, 78.0 5%, 10.71% and 0,0%, respectively. The grazing pattern was open. The 5-layer average chemotherapy coverage was 85.29%, 56.0%, 30.13%, 24.56%, respectively. Conclusion The number and time of herd in Dongting Lake are related to the distance from the embankment. The closer to the embankment, the larger the proportion and the farther away from the embankment, the smaller the proportion. Herd-based chemotherapy should be based on whether there is snail herding in the continent