| Summary: | Caituozi Island is located in Changhai County of Dalian, which is an uninhabited island with the function of fishery. According to the characteristics of uninhabited island ecosystem and the function of fishery island, the pressure-state-response (PSR) model with three-layer index was built to evaluate the ecological status of Caituozi Island. Expert evaluation method, environmental quality index of single element method and comprehensive evaluation index method were applied to calculate weight value and index value of each level indexes. Based on field investigation data in 2015, ecological status score of Caituozi Island was calculated by using the analytic hierarchy process of PSR model. The result showed that the status of Caituozi Island was "Excellent" (The score was 0.811 1) . In addition, the evaluation method could be extended to assess the ecological status of other uninhabited islands for fishery by further optimizing the evaluation indexes.
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