目的　准确掌握本地区血吸虫病流行现状和流行特点 ,为调整防治措施提供科学依据。方法　采取分层整群随机抽样方法对人群和家畜血吸虫病作调查 ,用系统抽样结合环境抽查法对钉螺进行调查。结果　人群粪检阳性率为 3.89% ,其中山区为 6 .10 % ,坝区为 2 .98% ;男性为 3.10 % ,女性为 4 .6 0 % ,山区高于坝区 ,女性高于男性 ;5岁以下儿童粪检阳性率为 1.87% ,病人 EPG算术均数为 7.76 ,几何均数为 1.6 2 ;人群 EPG算术均数为 0 .30 ,几何均数为 0 .0 4。家畜平均粪检阳性率为 4 .36 % ,山区为 6 .0 6 % ,坝区为 2 .5 1% ,其中黄牛为 7.2 5 % ,水牛为 3.84 %。有螺框出现率 ,山区为 5 .70 % ,坝区为 1.82 % ;钉螺自然感染率山区为 0 .72 % ,坝区为 1.94 %。由本次抽样调查的人畜粪检阳性率 ,推算全州现有病人 3.2 1万人 ,病牛 810 0头左右。结论　传播阻断地区疫情相对稳定 ,传播控制地区疫情反复 ,未控制地区疫情依然严重 ,人群感染率和感染度有所下降 ,但耕牛血吸虫感染率与 1989、1995年抽样调查相比 ,并无改变 ,疫情态势不容乐观。 Objective To accurately grasp the prevalence and epidemic characteristics of schistosomiasis in this area and provide a scientific basis for adjustment and prevention measures. Methods Stratified cluster random sampling method was used to investigate the population and livestock schistosomiasis, and the snail was investigated by systematic sampling combined with environmental sampling method. Results The positive rate of fecal examination in the population was 3.89%, which was 6.10% in the mountainous area, 2.98% in the dam area, 3.10% in the males and 4.60% in the females. The mountainous areas were higher than the dam areas and the females were higher than the males. The positive rate of stool examination in children under 5 years old was 1.87%. The average number of patients in EPG was 7.76 and the geometric mean was 1.6 2. The mean of EPG in population was 0.30 and the geometric mean was 0. 0 4. The average positive rate of livestock excrement was 4.36%, that of mountainous area was 6.06%, that of dam area was 2.51%, of which, cattle were 7.25% and buffalo was 3.84%. The occurrence rate of screw frame was 5.70% in mountainous area and 1.82% in dam area. The natural infection rate of snail was 0.72% in mountainous area and 1.94% in dam area. According to the positive rate of man and animal manure survey conducted by this sampling survey, 32,100 existing statewide patients and 810,010 sick wails were estimated. Conclusions The epidemic situation in the area of ​​transmission block is relatively stable and the epidemic situation in the area of ​​transmission control is repeated. The epidemic situation in the uncontrolled areas is still serious, and the infection rate and the infection degree of the population decline. However, compared with the sampling survey in 1989 and 1995, Change, epidemic situation is not optimistic.