In order to analyze the plane distribution of the stress field in the southern section of Shunbei No. 5 fault zone and its development significance, YiJianfang Formation was selected as the research object. Based on the rock mechanics experiment, the numerical simulation of the stress field was carried out by ANSYS software, and the plane distribution of the stress field was predicted by combining with the in-situ stress displacement theory. The results show that the ground stress of the Yijianfang Formation in the north Shun region is controlled by the fault zone, and the direction of the maximum horizontal principal stress is mainly NE-SW, the direction of the ground stress around the fault zone changes quickly, and the direction of the maximum principal stress in the fault zone tends to be parallel to the strike of the fault. The distribution of in-situ stress is consistent with the distribution of fluid potential, and the fault zone corresponds to the distribution area of low fluid potential, which is the favorable accumulation zone of oil and gas. Considering the reservoir development type of Yijianfang Formation, the optimal orientation of well track varies according to the difference of reservoir. The drilling orientation of horizontal Wells in natural fractured reservoirs and thin reservoirs with low permeability in matrix should be parallel to the direction of minimum principal stress, and the drilling orientation of horizontal Wells in thick reservoirs with low permeability in matrix should be parallel to the direction of maximum principal stress.