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Energy-saving and emission -reducing has become the strategic focus of China's economic development. Power generation industry, with characteristics of high energy consumption and high pollution, has great potential in energy-saving and emission- reducing field. Several methods can be used in energy saving and emission- reducing of power generating side, such as adjusting the power structure, establishing dispatch and trade mechanisms, as well as tax lever strategies, etc.. In this article, the trading results under the energy-saving goal were studied from the dispatch and trade mechanism perspective. Further, following models were established: trading results comparison model with emission reduction constraints and energy-saving goal; energy trading optimization model between two regions and among multiple regions, both considering constrains of energy-saving and emission- reducing.