Constrained by regional tectonics, sea-level changes, upwelling oceanic currents and palaeoclimates, the sedimentary environments in the middle-upper Yangtze area appeared as the neritic shelf during the Early Cambrian （Terreneuvian -Series）. During the Meishucunian （Early Cambrian ）, the study area was covered by tidal-fiat clastic rocks, phosphorites, dolostones and siliceous rocks. Shelf siliceous rocks with phosphatic nodules and mudstones, and shelf deep-water basin carbonaceous shales and siliceous rocks. Finally till the Longwangmiaoan, the study area was graded into the carbonate platforms. The above-mentioned sedimentary facies and palaeogeographic evolution during the Early Cambrian shows the persistence of the deep-water depositional area along the southeastern margin of the Yangtze Block.