Objective To clarify whether the western edge of the Kaijiang-Liangping trough is connected to the eastern platform margin of the Pengxi-Wushengtai Depression in the north of the Late Permian Changxing-Early Triassic Feixianguan period in northwestern Sichuan Basin， and to determine the sedimentary facies distribution pattern of the Jiangyou-Jiange Formation in northwestern Sichuan Basin and the Changxing Formation-Feixianguan Formation in the periphery area， and to analyse the evolution process of sedimentary filling to indicate further oil and gas exploration work. Methods Based on the latest drilling， field outcrop， and seismic data， this study systematically analyzed the distribution of lithofacies and paleogeography during the deposition of the Changxing Formation-Feixianguan Formation in the Guangyuan-Jiangyou area， based on the stratigraphic and sedimentary facies division and comparison. Results The intersection area of the Changxing Formation-Feixianguan Formation can identify six sedimentary facies： shelf basin， slope， platform edge， open platform， restricted platform， and evaporative platform. Based on the sedimentary records of the front slope of the platform， the western edge of the Kaijiang-Liangping trough and eastern edge of the Pengxi-Wusheng intra-platform depression were clearly merged to form a unified platform edge belt in the Cilinbao-Shangsi area in northwestern Sichuan Basin. The platform edge belt and front slope show a northwest finger shaped interdistribution， rather than a simple smooth belt distribution. The intersection area of the two troughs in the Changxing Formation presents a sedimentary pattern of two troughs interlocking from southwest to northeast. The connecting area of the platform margin zone developed a northwestern fingered reef beach， developing bioclastic shoals in the 1^st member and biological reefs and shoals in the 2^nd member of the Changxing Formation at the platform edge zone. During the sedimentary period of the 1^st and 2^nd members of the Feixianguan Formation， the sedimentary pattern of Changxing depositional period was inherited； however， in the 1^st member of Feixianguan Formation， only local platform edge oolitic beaches were formed owing to sea flooding. In the stage of the late 1^st to 2^nd member Feixianguan Formation， platform edge oolitic beaches gradually developed and expanded in scope with an overall eastward migration. The slope in front of the platform was prone to sliding and sedimentation. During the sedimentation period of the 3^rd member of the Feixianguan Formation， the sea trough gradually filled， and the finger shaped platform edge zone disappeared， forming a unified restricted platform. Only the local development of oolitic beach. The research area was filled and flattened during the depositional period of the 4^th member of the Feixianguan Formation， forming an evaporative platform facies. The platform margin zone in this region did not migrate northwestward along the finger shaped platform margin zone， but rather exhibited eastward migration characteristics. Conclusions The determination of the Changxing-Feixianguan connectivity and the definition of five sedimentary filling evolution stages in the Kaijiang-Liangping trough and Pengxi-Wusheng intra-platform depression supplements a new understanding of the sedimentary pattern and filling evolution process in the intersection area of the Changxing-Feixianguan trough. It also provides ideas and references for oil and gas exploration in this area.