Abstract: The provenance system restricted the flow direction of interlayer water and the distribution characteristics of sandstone reservoirs. The previous analysis of the upper Cretaceous provenance system in the northern Songliao Basin was focused below the Sifangtai Formation, and there was a lack of reports on the origin of the Sifangtai Formation. We systematically studied the characteristics of source systems of the Sifangtai Formation at the southern end of Daqing placanticline in the northern Songliao Basin using regional geological understanding, through sedimentary structural analysis, sand body distribution pattern and heavy mineral analysis, and identified the source direction and parent rock type. The results showed that the main parent rocks of the Sifangtai Formation are intermediate acid magmatic rocks and intermediate and high-grade metamorphic rocks. Through contrast analysis with the source regions, it was concluded that the provenance of the Sifangtai Formation in the south of Daqing placanticline was mainly from the Zhangguangcai Ranges, the eastern Jilin-Heilongjiang provinces and the southeastern region of the basin.