In recent years, with the development of oil exploration in South Turgai basin, the importance of buried hill in Doshan area has become clear. Based on tectonic analyzing and using basic factors, such as source rock, reservoir rock, oil migration and local structure...etc, the research suggests that it could be very hard for hydrocarbon to accumu- late with large scale, the oil-gas can only be gathered in certain area with small scale, due to the inhomogeneous distribu- tion of cap rock. Mean while, the prospect area in work area can be divided in three types, where the type I and II have favorable potential for further exploration.