The Early Permian Qixia Formation in the Hubei-Hunan-Guangxi region was mainly formed in a dysaerobic environment. Through reconstructing the feature of the oxygen-dissolved quantity and its change in waters during its deposition, 6 oxygen related facies (ORF) and 4 ORF successions have been recognized in the formation. The ORF,ORF succession and span of ORF shift have respectively shed light on the phase, velocity and amplitude of the sea-level changes, and played a crucial role in the recognition of the key surf ace, parasequence, depositional systems tract and depositional sequence. As genetically analyzing the internal architecture of the depositional sequence , the ORF analysis is important for the analysis of the sequence stratigraphy of dysaerobic strata with a monotonous facies association and showing no significant variation in facies thickness.