Abstract: The inner Proterozoic interior reservoir is a key area for pre-exploratory discovery of Liaohe depression, there mainly developed three types of dolomites, quartzites and argillaceous rocks with different characteristics in the Proterozoic. It can be divided into 18 substrata, even substrata are dolomite reservoirs, and odd substrata are interlayers. The inner Proterozoic reservoir has the characteristics of small formation control and high point enrichment and the exploration focuses on the characterization of internal structure. Three point method and dip angle can be used to determine the occurrence of small layers, to determine the internal structure by seismic data, and to determine the internal characteristics by logging and other attributes.