Recently， the proportion of deep-water incremental reserves has increased gradually each year. This proportion has exceeded 50% since 2010. Deepwater environments have become a key area of future oil and gas exploration. As one of the main reservoirs for deep-water oil and gas exploration， deep-water channels have attracted increasingly more attention. Based on high-resolution （40 Hz） 3D seismic data， this study carried out a detailed description of an aggradational channel-levee complex in the study area. The centerlines of the different channels in the complex were recognized from bottom to top. The overall width of this channel-levee complex is 25~30 km. The width of the single-channel is about 300 m， and the thickness is estimated to be 12 m. The channel morphology of this complex shows an organized evolution. The channel was relatively straight with low curvature at the beginning of aggradation， and the curvature gradually increases over time. During aggradation， the deep-water channels not only swing but also sweep downstream. Predecessors believed that downstream sweep is very rare in deep-water channels； however， our research shows that this phenomenon may be common under some special conditions.