Gravity flow channel complex is developed in A oil layer of E Oilfield in deep water area of Niger Delta Basin. The multiple phases of channels and complex stacking relations of them lead the difficulty to develop the oilfield. Based on the analysis of seismic data, well logging and core photos, the sedimentary characteristics of gravity flow channel complex of A oil layer is illustrated, the level of phase anatomy of channel complex is discussed, and it is suggested that the phase subdivision of composite channel is very practical. The method of phase subdivision by the way of multi-stage cycle correlation from well data to seismic data is proposed. Firstly, based on the core data, the phase and interface marks of deep water gravity flow composite channel are summarized, secondly, the core-scale phase of composite channel is divided, and the logging-scale phase of composite channel is determined by combining with logging data, finally, the seismic-scale phase of composite channel is determined by combining well and seismic data, and the seismic tracking interpretation is carried out. At last, on the basis of genetic analysis, a sedimentary evolution model of composite channel is established.