The deep-water sedimentation of Upper Miocene Huangliu Formation reveals one whole single sedimentary cycle from early forced regression to late transgression in Dongfang Gas Field, Yingehai Basin. The sedimentary characteristics and development rule are discussed on each cycle. The study area is divided into three blocks according to the sediment source and geomorphology. The Huangliu Member-1 deep-water sediments are characterized by multiple-source supply, sand-rich environment, gentle gradient slope and small-scale plain basin, which is a typical deep-water sedimentation model controlled by the sedimentary cycle and geomorphology, especially stratigraphic cyclicity. The prospective reservoirs should be the leveed channels and the frontal flood fan that formed during late forced regression to low-stand normal regression and early transgression. The later following cutting-downward channels that formed during early transgression play a role of segmenting the primary continuous turbidity-flow sand body off, which just is the present distribution pattern of sandy reservoir.