Source- to- sink system is a hot topic in geosciences, which has an important guiding role in the paleogeographic reconstruction of hydrocarbon- bearing basins and in the prediction and evaluation of source and reservoir of hydrocarbon resources. This study takes the Permian in Junggar basin as an example to analyze the stratigraphic and sedimentary pattern in basin- scale geological sections to investigate the evolution of the provenance system based on the chronostratigraphy, and to set up stratigraphic forward models based on sedimentary constraints. Finally, it explores the evolution and source- reservoir distribution of the source- to- sink system. In the Early Permian, which belonged to faulted basin, Carboniferous of the basin s periphery provided the majority of sediments. Fan delta to lacustrine sedimentation with nearby provenance is dominant in most regions, while marine and continental- marine transition sedimentation developed in the southeastern region. The depositional pattern influenced by multiple faults controlled the distribution of high- quality hydrocarbon source rocks in the Mahu and other depressions, and the sand bodies in delta front and dolomite associated with volcanic rocks constituted favorable reservoirs. In the Middle Permian, which belonged to the transition period from faulted basin to depression, the dating results shows that provenance range tended to be wide and complex. The sedimentation center and subsidence center obviously migrated to the inner basin, and the early- formed faulted sags tended to be connected. The western part of the basin is still dominated by the fan deltas to lacustrine sedimentation system with nearby provenance, while the southeastern part converted to fan deltas to lacustrine sedimentation with distal provenance. The large- scale hydrocarbon source rocks with high connectivity in the central basin can form good source- reservoir association with the delta front formed during this period. In the Late Permian, which belonged to depression, provenance range tended to wider or more complex. Large shallow lake allowed the development of regressive river- delta systems with distal provenance. They provided the reservoir for the basin- scale stratigraphic reservoirs.