Abstract: Combined with the development of fractured hydrocarbon reservoir of Yaoyingtai Oil field in the Changling Sag of the Southern Songliao Basin,the paper quantitatively analyzes the ground stress field and the natural fracture field,and sets up an areal model to simulate the tectonic stress field and compares it with the actually measured ground stress value by taking the reservoir structure as the study object so as to obtain the distribution characteristics of the stress field.Based on the palaeotectonic stress field formed in the reservoir fracture and the theory of elasticity,by using of the fracture criteria of rock,it determines and predicts the group,azimuth and density of the reservoir tectoclase.The study of the development distribution of stress field and natural fracture field determines the well groups for the field experiment and instructs the fracturing treatment and the design optimization and field application of the well pattern arrangement for the field development.