Abstract: This paper analyzed the degradation in ecological service function of Xiamen Bay, and illustrated the key affecting factors, including unreasonable sea reclamation and sea-bank construction, unsuitable coastal resources exploitation, and lagged pollution treatment works in intensively exploited coastal area. The great expenditure and difficulty of damaged ecological service function restoration suggested the great ecological function value of undamaged ecosystem, and the great economic value of harmonious development of economy with environment protection.

Key words: Urbanization, Landscape structure, Construction land use, Shenzhen