Abstract: The Sansha Bay, representing a typical bedrock semi-enclosed bay in eastern China, is the largest bay in Fujian Province. Processes of erosion and accumulation in Sansha Bay are affected by sediment provenance derived from mountainous rivers and tides. Therefore, understanding the characteristic of sediment provenance has critical significance for discussing sedimentary evolution in the bay. In this study, we conduct a heavy minerals and geochemical elements analysis of drilling core NDGK2 obtained from Sansha Bay, reconstruct the evolution history of sediment provenance since approximately 90 ka, based on the published stratigraphic sequence and chronological framework. Under the influence of global climate and sea level changes, sedimentary evolution patterns in Sansha Bay were proposed. The result shows that minerals were dominated by authigenic pyrite with relatively low zircon contents and low ZTR index during the high sea level stages of (marine isotope stage) MIS5, MIS3, MIS1, and were dominated by limonite with relatively high zircon contents and high ZTR index during the low sea level stages of MIS4 and MIS2. Major and trace elements are characterized with obviously high content of Ti, Ba, and Ni during stages MIS5, MIS3 and MIS1 and low Ni and Ba contents during stages MIS4 and MIS2. Both mineral and element proxies suggest that the suspended sediments in the high sea level stages since 90 ka were mainly derived from Yangtze River and probably transported by tidal currents. In contrast, sediments in the low sea level stages consisted of the mixture that was derived from local rivers represented by Huotong River and from Yangtze River. Compared with inland area, the characteristics of sediment provenance and palynological assemblage indicate that Ningde area is not sensitive to global cooling events and rivers are still relatively developed even in the glacial period. On the Earth's orbital scale, a high sea level plays a more substantial role than the terrigenous input in the formation of sedimentary environment. This study provided a valuable insight into the quantitative study of modern sediment sources in the Sansha Bay.