Dingshan area is a hot field in the exploration and development of shale gas in Southeastern Sichuan in recent years，preservation conditions are important for the accumulation of shale gas after its generation. Through the analysis of structure factors such as fracture characteristics，structure location and shape，and other non-tectonic factors such as shale gas roof and floor condition，depth and formation pressure coefficient，hydrogeology and gas composition，the shale gas preservation condition was analyzed in the study area. The results show that the preservation condition of Dingshan area has obvious zoning characteristic. The shale stratus close to Qiyueshan buried fault are characterized by poor preservation conditions with shallow depth and small formation pressure coefficient. The shale stratus far to Qiyueshan fault are characterized by good preservation conditions with moderate depth and high stratigraphic pressure. Structure location and fracture development characteristics are the most important factors restricting the shale gas preservation in Dingshan area. Structure location determines the fracture development and formation pressure coefficient. Fault strike and its direction to the maximum horizontal principal stress determine the sealing and hydrogeological conditions of the formation. The shale stratus far away from Qiyueshan buried fault are dominated by thrust faults，and their angle with the maximum horizontal principal stress are mainly more than 45°，which can effectively suppress the vertical escape of shale gas. Faults are extensively developed close to Qiyueshan buried fault and they cut through the upper and bottom strata，which facilitate the vertical dissipation of shale gas，and lead to a poor preservation condition.