Abstract: The author has proposed a new explanation to link an oceanic environment crisis 650 Ma ago to the origin of the Baiguoyuan Ag-V deposit on the basis of the new finding of K-feldspar microspherules and negative carbon isotopic shift in the ore-bearing units^1,2.In this paper,the important information about the anoxic events is presented to reveal the mystery of Precambrian oceanic evolution on the Yangtze platform.