Through the petrologic and geochemical characteristics of the carbonate concretions,the study ananlyses is that the carbonate concretions are diagenetic concretions and they were fomed in the middle diagenetic.The formation of the carbonate concretions is multistage.Combined with normal shallow diagenetic type comprehensive biogeochemical response pattern analysis,the carbonate concretions formed in the stranded and anoxic environment.They mainly formed in sulfate-reducing zone .They grown as penetrative pattern.Carbonate cements in the carbonate concretions were crystallized and grown at the same time.