Vulnerability is the hot focus and front field in the global environmental change studies and it is also contented by many important science plans.Regional system of man-sea relationship,as a key content of marine economic geography,promotes the positive recycle of man-sea relationship and the whole regional system of man-land relationship,and it pushes in the development of man-land territorial system and regional sustainable development.Based on comprehensive development data of coastal cities in 2007,the article analyses the relationship between regional economic development,resource-environmental resumption and society development,using the triangle methodology to select indictors by susceptibility,adaptation and resilience for constructing vulnerability indicator system and appraisal model,then classifys into 6 types of man-sea territorial system of 53 coastal cities of China.The results are as follows:(1)from the region aspect: most of coastal cities in east area,northeast area and central area belong to ES type,and some east area cities belong to ENS type; (2) from the city hierarchy aspect: the megalopolis and big cities mainly belong to ES and ENS type,most of medium cities are ES type,and three small cities are all ES type; (3) according the vulnerability restriction factors,it proposes sustainable development strategies.