Abstract: Reclamation and development of coast zone has produced important influence on its landscape patterns and ecological processes. Taking Dongtai County, a typical reclamation district of Jiangsu Province, as a study area, this paper analyzed the spatial distribution characteristics of ecological function based on GIS space technology and the
minimum cumulative resistance (MCR) model. Then the authors put forward the landscape pattern optimization model of Dongtai by constructing ecological sources, ecological corridors and ecological nodes. Longtime and largescale reclamation led to high landscape fragmentation and low connectivity of landscape patterns. Ecological function in the study area gradually weakened from east to west. The space analysis of ecological function based on the cumulative resistance model is the key to locate the ecological sources and to analyze ecological stream running. Protecting sources, building corridors and strengthening nodes are the main optimization measures to improve the ecological functions. The study provides a scientific basis of decisionmaking for relevant departments to carry out targeted ecological protection in Dongtai.

Key words: complete ratio vegetation index, incomplete ratio vegetation index, non-ratio vegetation index, topographic effect, geometric optical model.