Abstract: The present paper gives a detailed description of sedimentary characteristics,facies sequences and genesis of the storm deposits from the Zenglongchang Formation of the Zha’ertaishan Group in Guyang,Inner Mongolia.The dolostones in this region are interpreted to be accumulated according to the facies sequences of storm deposits.The findings may have important implications for the study of sedimentary environment and palaeogeography of the Zha’ertaishan Group in the study area.