Abstract: Based on 1∶50000 DEM and hydrological data of Three Gorges reservoir in Chongqing,considering to the change of water-level-fluctuating zone,the distribution of Oncomelania snail breeding in Dachang,Wushan was analyzed by using ArcGIS technology.Climatic ecological environment of Oncomelania snail breeding were analyzed by using of climatic data and vegetation factors.The results showed that all monthly average temperatures were greater than 5.87℃,the threshold of Oncomelania snail growth.The minimum of annual accumulated temperature(>5.87℃),6160.7℃·d,was greater than the threshold of whole generation of Oncomelania snail demand,5821.38±70.05℃·d.The minimum active accumulated temperature(>11.79℃) during March to April was 642.1℃·d,the minimum annual precipitation was 997.3mm,the average NDVI value was 0.22.The climatic ecological environment conditions of Dachang could meet the demand of Oncomelania snail.So,it was necessary to strengthen surveillance of the potential Oncomelania snail habitats in Three Gorges reservoir region to prevent the snail spreading from Hubei and Sichuan areas.

Key words: Oncomelania snail, Oncomelania snail, Three Gorges reservoir region, Water-level-fluctuating zone, Climatic ecological environment