Based on the results of existing research data analysis and understanding, this paper explores division principles of marine hazard geology. According to the boundaries of large tectonic geomorphology it can be divided into 4 hazard geology regions, i.e.coastal, continental shelf, continental slope, basin and trough hazard geology regions. According to geographical location and hazard geology environmental features it can be divided into 24 hazard geology sub-regions. In addition, based on the hazard factor and disaster pregnant environment the geological hazard risk level in China waters is qualitatively divided into 4.