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Based on the partition of second sequence��the sequence can be divided into seven third-order sequences by applying high resolution sequence stratigraphy in Shenhu area of northern slope of South China Sea�� where gas hydrate is more valued�� Under the control of third-order sequence��five seismic facies including sheet�� wedge shape��lenticular��mound��filling��and sixteen seismic subfacies can be distinguished in the Shenhu waters�� Sedimentary facies development is given priority to the turbidity current and mud flow�� The overall features of sedimentary environment evolution of Shenhu area is sea level falling��with development of the strata of bathyal-deep facies to shallow facies from sequence C to A�� The bathyal-deep facies are from up continental slope down��