The assessment of ecological environment during the large-scale development of islands is a major topic
in the study of current coastal islands. Choosing the appropriate assessment method to evaluate the suitability of carrying capacity
of islands and making relevant suggestions are significant to the sustainable development of islands. Ecological footprint method
is used to analyze the ecological carrying capacity of Pingtan Island (PI) from 2005 to 2016 for promoting the coordinated rational
development and construction and ecological environment of the island. Although PI is in rapid urban development and construction,
the island maintains secure and stable ecological conditions. PI is used as a research case to analyze the sustainable development
of the ecological environment through the carrying capacity of the island ecosystem.
The sustainable development of the marine economic system to accurately grasp the dynamic evolution characteristics and main driving factors of the vulnerability of the marine economic system so as to effectively identify the problems in the operation of the marine economy is extremely important. Based on the establishment of a three-level assessment index system for the vulnerability of the marine economic system, the vulnerability of the marine economic system of Jiangsu Province in 2008-2016 was evaluated by using the comprehensive index model and the catastrophe progression model, and the results were compared based on the unified evaluation criteria. The main influencing factors were analyzed by principal component analysis and Pearson correlation analysis. It's found that 2014, 2015 and 2012 are in a general state, 2009 and 2010 are in a poor state, and the vulnerability state from 2008 to 2011 is lower than that in 2012. The overall volatility is small indicating a stable system. Among them, the scale of marine industry and profit and loss of marine resources are the main components of marine economic system vulnerability having the highest correlation with the vulnerability of marine economic system. This study enriches the theoretical method and empirical research on the vulnerability of the marine economic system and has practical significance in allowing for timely targeted control measures to affect the vulnerability of the marine economic system.
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