document: The retrospective assessment of environmental carrying capacity aims to obtain the historical development situation of reclamation domain, it's an essential tool for improving the managed level and guiding the environmental management of reclamation. In this paper, a synthetic assessment method based on cloud theory is applied to evaluate the single factor and multiple factors environmental carrying capacity in Caofeidian marine district, Tangshan Bay, China. With the field data of five assessment indexes in recent six years, the assessment results are obtained which show that the marine reclamation has a certain impact for the marine environment.
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