Abstract: According to the work experience of the Guangzhou Marine Geological Survey (GMGS), a set of methods for integrated investigation of marine geo-environments in coastal zones has been acquired. It can evaluate the quality of marine geo-environment by performing a multi-means, multidisciplinary integrated analysis of the quality of the geo-environments such as the seawater environment, sedimentary environment and engineering geological conditions, and can also forecast the developmental trend of the marine geo-environment. The results of the investigations can be used for the comprehensive management, ocean exploitation and construction of engineering structure in coastal zones and can also provide basic scientific data for planning, environmental protection and sustainable economic development in coastal zones.