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With the aim of the harmonious development of economy-environment system in coastal cities in China, an index system used to evaluate the economy-environment system is built up in this paper, which includes four aspects: economy,environment, resources, and ocean industry. Based on the analysis on present condition and future trends of economic development in Tianjin and the quantification of various evaluation indices, the author applies integrated index valuation model to valuate the harmonious development of economy-environment of Tianjin. The results show that the coordinated degree of economy-environment would drop down in the future, from 0.95(superior level of harmonious development) in 2000 to 0.59(inferior level of harmonious development) in 2015, under the circumstance of the current economic development mode. The level of comprehensive development of Tianjin also presents to descend. Based on the analyzing of status and future trends of environment-economy coordinated development, the paper puts forward the countermeasures such as industry structure adjustment, increasing the level of environmental protection investment, strengthening the enforcement of environmental policies to improve the coordinated development of environment-economy in Tianjin municipality.