鄱阳湖为我国第一大淡水湖 ,沿湖 11个县 (市、区 )为我国最严重的血吸虫病流行区之一。由于这类疫区水位呈季节性变化 ,有螺面积辽阔 ,地理环境和流行因素复杂 ,人、畜同为传染源 ,故血吸虫病疫情长期得不到有效控制。为阐明地理环境对血吸虫病之传播影响 ,自 2 0世纪 80年代 Poyang Lake is the largest freshwater lake in China and 11 counties (cities and districts) along the lake are one of the most endemic areas for schistosomiasis in China. Due to seasonal changes in the water level of such epidemic areas, the vast snail area, complex geographical environment and epidemic factors, people and livestock as the source of infection, so the long-term schistosomiasis can not be effectively controlled. To clarify the geographical environment on the spread of schistosomiasis, since the 20th century, 80 years