In order to reveal the spatial-temporal change of climatic and ecological effect in the Changjiang River Basin with the construction of Three Gorges Project,since 1996,an ecological and environmental monitoring system of the Three Gorges Project was established jointly and a climate monitoring sub-system was put in practice at the same time. Not only climate monitoring in the Three Gorge reservoir area is run,upper-air observation with moorage balloon sounding and radarsonde is also carried out in the east and west in the reservoir. Detailed and reliable background data are accumulated,the Three Gorges reservoir area climate monitoring products have been provided to Three Gorges Construction Committee and China Three Gorges Development Corporation every year to serve the Three Gorges Project construction.