Abstract: With the development of world economy globalization and the needs of actualizing sustainable development and all-around construction of a well-to-do society in China,Chinese ecological agriculture is facing new opportunities and challenges.In past two decades,great achievements were made in the development of our ecological agriculture,and so far,there are more than two thousand counties,towns and villages in actualizing ecological agriculture.However,many practical problems are still existed,e.g.,less attention to ecological agriculture,lack of ecological technologies and construction funds,and poor construction of infrastructure and ecological management in agriculture.Moreover,there are many scientific and technological issues which should be studied,e.g.,the concept and classification of ecological agriculture,the ecological processes,mechanisms and functions of ecosystems,the scale transformation and spatial and temporal change patterns,and the security of ecological agriculture.To promote the ecological agriculture in China,it is necessary to conduct eco-agricultural planning in whole China,to increase construction fund and put forward a series of new favorable policies for the construction of agricultural infrastructure and social service systems,to restructure and optimize agriculture and develop ecological industries,and to promote the industrialization,standardization and information development of ecological agriculture.

Key words: Wetland, Plant, Mercury, Sanjiang Plain