Research on China´s marine industrial structure optimization based on circular economy

China´s marine industrial structure is approaching to be reasonable, while the total value of marine economic output is expanding unceasingly and major marine industries are under relatively stable development. This paper attempts to be guided by circular economic principles and uses gray relation analysis as a way of analyzing correlation between contributions of marine GDP and changes of China´s marine industrial structure, and get the conclusion that China´s marine second industry makes the greatest correlation to contributions of marine GDP. Furthermore, some countermeasures of marine industrial structure optimization are presented.