Li, Y., 2020. Mathematical economics analysis of macro debt and economic growth in coastal areas. In: Yang, Y.; Mi, C.; Zhao, L., and Lam, S. (eds.), Global Topics and New Trends in Coastal Research: Port, Coastal and Ocean Engineering. Journal of Coastal Research, Special Issue No. 103, pp. 90–94. Coconut Creek (Florida), ISSN 0749-0208.

Path choice of economic development for a country is a very important question. After China adopt the policy of Reform and Opening up, the economic development model depending on high investment and high debt has been established gradually, which causes the success of China economic development. Especially, the economic development of the coastal regions has provided a powerful impetus for the progress of the entire country. However, this pattern overly depending on the investment and debt accumulation brings hidden trouble to China's future development of high quality. In this paper, the economic relationship between the debt accumulation and economic growth will be analysed in detail by the mathematical analysis tools and optimization theory. At the same time, this article also proposes that coastal economic areas should take the lead in developing technology-intensive industries and vigorously develop the marine economy to achieve economic transformation.