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Abstract:

This article examined the influence on the distribution of 〖WTBX〗Oncomelania〖WTBZ〗，the middleparasitizeder of schistosome，the changing by ecological environment such as the water level，vegetation and climate，resulted from key projects such as Three Gorges Project，the resubmerging particular polders and the SouthtoNorth Water Diversion Project. An analysis to change trends of schistosomiasisinfected regions and the possibility of 〖WTBX〗Oncomelania〖WTBZ〗 northing distibutionally predicted that these regions have the potential risks of schistosomiasis，combined with the area of 〖WTBX〗Oncomelania〖WTBZ〗 have increased significantly，while the overall situation is still severe. At present，the relevant works on the ecological environment and schistosomiasis research influence，mainly local investigation reports and forecasts on the basis of the existing works on the prevalence of schistosomiasis may affect the ecological environment changes will take time to verify. Therefore our study suggests that using RS and GIS technology to monitor changes in the analysis of the ecological environment and socioeconomic changes and further study the relationship between these changes and spread of schistosomiasis，at the same time，areas implementation of the project should increase the areas of the masses of selfprotection awareness and ability，combined with forestry，water conservancy projects that have transformed the environment.

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