Abstract: After a brief discription of geological structure of China coastal zone, the authors suggest that the geodynamic system since the Cenozonic Era fundamentally determinedthe different paterns from the south to the north in the coastal geological environment and disasters in eastern China. More over, the general features of engineering geological environment in the coastal area and the problems concerned during engineering construction are expounded in the paper. A primary assessment of future tendency of geological environment and disasters in the coastal area, especially in three deltaes regions, i. e.Yellow River, Yangtze River and Zhujiang River deltaes, is made on the basis analysisof global sea level changes as well as those in China coastal zone over the past 100 years,the regulavities of crust morement, and the impact of human engineering activities on geological environment in the coastal zone of river mouths. Therefore, it is evident that the environment and the sustainbale development in China coastal areas, espacially in the Bobal Rim in the 21st Century will face to severe challenges. According to the distribution of natural resources and geological-geographical environment features, and the needs for sustainable development strategy in the future, several countermeasures and suggestions are set forth.