Abstract: According to the features of the sedimentary facies and faCies associations,the carbonaterocks of the Dengying Formation in the Nahua area ,northern Hubei,are divided,from the bot-ton to the top,into three sedimentary facies belts: evaporite platform,restricted platform tidalflat,and open platform largoon. This pattern of environmental evolution indicates a generaltrend of slow sea-level rise. Study of sequence stratigraphy shows that two stratigraphic se-quences can be recognized in the Dengying Formation,and both represent a secondary fluctua-tion on the background of slow rise during the late part of the Late Sinian,The duration（ca.tens of millions of years）and rate（ca. a few of tens of mm/1000 yr）of sea-level rise of eachsecondary to the 2nd-and 3rd-order cyclic sea-level change.