According to the observation and description of core ,well logs ,seismic reflection feature and grain-size analysis data ,the sublacutrine fans found in the center of the Wuerxun sag.From the root to the margin of the the sublacutrine fans, It can be successively dividede into four subfacies and six microfacies，feeder channel,iner fans（main channel ,between main channel）,middle fans（braided channel ,between braided channels and cetral microfacies）and outer fans（the turbidite rocks）.There are features of the deep sedimentary environment and the gravity flow(debris flow,grain flow and turbidite flow) transport of sediments.