Nanchuan area is located in a complex tectonic area in the basin-margin transition zone of Sichuan Basin，and its Longmaxi Formation dominated by normal-pressure shale gas is endowed with favorable shale gas accumulation and enrichment conditions.However，the complex in-situ stress field and the large difference in single-well production become the key factors restricting the profitable development of the normal-pressure shale gas. Field profile survey，numerical finite-element stress field simulation，and special imaging logging were conducted，and the regional stress field was investigated. Moreover，lots of practices in shale-gas horizontal well fracturing were reviewed. The following three conclusions were thereby obtained：①In the Mid-Yanshanian，the maximum principal stress was in the east-west（EW）direction in the anticline area and in the northeast-east（NEE）direction in the southern monoclinal zone in Nanchuan area；Since the Himalayan period，the current horizontal in-situ stress field has been characterized by marked planar zoning，with local transition zones of in-situ stress direction and magnitude. In the vertical direction，the insitu stress has descended with the increase in depth under the influence of lithology. The in-situ stress in local silty sandstone and that in the local shell limestone in Guanyinqiao Member have increased substantially. ②The in-situ stresses in Longmaxi Formation were mainly affected by the intensity of tectonic reworking，tectonic style，burial depth，and fracture development，and they were high in the weak tectonic reworking，the deep burial depth，the core of anticline or syncline，or the few natural fractures areas. ③The in-situ stress field has a great influence on the production of shale gas wells. Specifically，the paleo-stress field controlled the development of natural fractures and affected the physical properties and gas-bearing properties of reservoirs. In contrast，the current in-situ stress field influenced the complexity of artificial fractures. A smaller angle between the horizontal well trajectory and the minimum horizontal principal stress，on the premise of moderate in-situ stress，corresponds to easier stimulation，which is more beneficial for creating complex fracture networks and further improving single-well production. This research can effectively guide shale gas exploration and development in Nanchuan area.