The Sinian strata in the Xuyi area of Jiangsu Province, China are composed of mixing  sediments. Based on the research on the mineralogy, lithology, sedimentary facies of 6 measured sections and 67 investigating sections in this area, the sequence and sedimentary environment of the Upper Sinian mixing sediments are provided here. Eight sedimentary facies are recongnized, and the depositional system and sedimentary framework are reconstructed. The results show that during the Late Sinian the sea level changes is drived by the climate under a stable tectonic background, and the terrestrial clastic deposits are accumulated on the costal plain during the selevel rising.