The research on marine economic area system is the most important part in manearth relationship area system in China. This paper discussed the characters of marine economic area system from the point of man- earth relationship area system. Firstly the paper analyzed the marine resources, marine industry and the development process of China. Then the author analyzed the developing condition of marine economy based on space and time changing. What's more, this paper evaluated comprehensive strength of marine economy over years by using some econometric methods such as principal component analysis, and drew the smooth curves between the total value of marine economy and marine industries, which gave the linear trend of the increase of marine industries. According to the development of marine industries, the author analyzed the character of marine industries and drew a tri- axial map to analyze the developing process of marine industry. At last, in order to reflect the differences between different area systems of Chinese marine economy, the author used the method of principal component analysis to give an evaluation and classification of comprehensive strength of coastal province and cities. Based on this result, some marine economic regions are classified according to the comprehensive strength.