Abstract: The present paper gives a detailed description of the sedimentary evolution, depositional systems and spatial distribution of the source rocks, reservoir rocks and cap rocks in the Lunpola Basin, Xizang. The basin is believed to be highly prospective for the exploration of oil and gas resources. The current state of tectonic traps may have exercise a major control on the oil and gas development, and thus it is necessary to search for the nontectonic traps favourable for the oil and gas accumulation in the basin.