Abstract: In this paper,the regional tectonics,sedi mentation,source-reservoir-overlying formations,pre-servation conditions,hydrocarbon accumulation and resource extent about the marine oil-and gas-bearingbasins in Yunnan-Guangxi-Guizhou Region were discussedin accordance with the petroleumgeologic char-acteristics of the basins.The main conditions of oil and gas pool forming in the basins were summed up,and the drilling effect analysis on the recent three i mportant exploration wells in the basins was made.Then,the direction and focal points of oil and gas exploration as well as the ideas of comprehensive re-search about the marine basins in Yunnan-Guangxi-Guizhou Region for the future were put forward.