In this paper, the authors studied the reservoir geological model and its significance of Chang 2 of Triassic Yanchang of Zhanghan Area in Dingbian. Based on a large amount of drilling, logging, analyzing test and dynamic data, the deterministic modeling methods and stochastic modeling methods are used. The comparative analysis of geological model and manual geological plane map shows their consistency. The established geological models really reflect the actual geological conditions of the study area, which provides a reliable geological basis and a set of grid data volume for tapping resident oil in the layers and adjusting well network at a later stage.