According to the characteristics of Three Gorges reservoir ecosystem in Chongqing of China, the index for potential capacity of ecological environment is amended for early warning evaluating the ecological security in 22 counties of the Three Gorges reservoir. Capacity of ecological environment was ranked into five levels, e.g., urgent warning, heavy warning, middle warning, light warning, and no warning. The results demonstrated that the development situation of ecological security in the

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... Gorges reservoir was not balanced; meanwhile, there remained the serious ecological deterioration in some regions, indicating that the polarization phenomenon was greatly serious our results suggest that some applicable strategies should be proposed for optimized development.