Abstract: The Three_Gorge Project which is builded in the present has been and will have great influences on the agricultural production in the middle reaches of the Yangtze River, such as Jianghan Plain Area. In accordance with the characteristics of the resources and agricultural eco_environment as well as the influences of the Three_Gorge Project, the agricultural sustainable development in the area must be started from bringing the eco_environment under comprehensive control and rebuilding the agricultural eco_economic systems. Based on scientific program and rational distribution, to drain waterlogged areas, to give farmland back into lakes, to build irrigation and drainage works and to develop farming_afforested_stockbreeding_fishculturing compound eco_economic models have to be done.

Key words: Bursaphelenchus xylophilus, nitric oxide synthase, nitric oxide, secretion of nematode, environmental factor.