Abstract: The development of the Silurian Longmaxi Formation shale reservoir in Wulong area of southeast Yudong has complex tectonic deformation, so the tectonic evolution time sequence and the direction of paleotectonic stress field are finely analyzed, and the characteristics of tectonic stress field in Wulong area are quantitatively characterized, which has important guiding significance for shale gas exploration and exploitation. Tectonic fractures are the main controlling factors of shale gas transport and accumulation, while paleotectonic stress fields control the deve lopment of structural fractures, which affects the exploration and development of shale gas in Wu- long area. In this paper, the direction of paleotectonic stress was determined by staging and supp- orting treatment of the developmental joints in Wulong area and its peripheral margin, and the cal- culation of paleotectonic stress could be carried out by rock acoustic emission experiments. On this basis, ANSYS finite element software is used to establish a geological model of the key tectonic deformation period of the Silurian Longmaxi Formation in Wulong area, and the boundary condit- ions are determined by the analysis results of the tectonic stress field, and the numerical simulatio- n of the tectonic stress field is carried out. The results show that the main tectonic deformation pe- riod in Wulong area is the middle period of Zhongyanshan and the late Zhongyanshan period, the maximum horizontal principal stress in the middle period of Zhongyanshan is 112-194 Mpa , the minimum horizontal principal stress is 60.93-147.99 Mpa, and the maximum horizontal principal stress is 75.67-168.32Mpa and the minimum horizontal principal stress is 31.19- 95.56 Mpa. The simulation results show that most of the regions with high maximum principal stress values are concentrated in the western oblique core of Wulong, the local area of the upper disk of the fault, and the inflection point and end point of the fault. The distance between the dominant preservation zone of shale gas and the fault upper disk is farther than that of the fault lower disk. The larger the curvature of the oblique nucleus, the easier it is to form "Λ" type fractures, which is conducive to the storage and preservation of shale gas, so the shale gas enrichment and preservation area of Wulong's west-inclined slope is better than that of Wulong's east-inclination. Studying the chara- cteristics of paleotectonic stress field is the basis for studying the development degree and deep fracturing effect of tectonic fractures, and is an important factor affecting high yield.