Abstract: The recent work has already come into the stage of subtle reservoir exploration period in the Langgu Sag of the Bohai Bay Basin.So it is the key issues to instruct next exploration direction that know the distribution characteristics about all kinds of pools in the sequence stratigraphic framework.By means of comprehensive analysis of sequence characteristic and deposit distribution combination,established formation pattern of diffe-rent tectonic unit in the Langgu Sag.And those are taken apart more in different sedimentary system and its combination styles.From the whole deposit and structural background,build on the distribution characteristic of the reservoir in the sequence framework.Six deposit formation patterns were established in the actic,billabong and center regions.And point out that the more sedimentary systems,more tectogenetic movement,the matching of source layer-reservoir-encirclement make importance action to the distribution and enrichment of structure and subtle hydrocarbon pools.