The lower Yellow River (LYR) was silted and elevated continuously, owing to an inherent heavy sediment and small runoff with insufficient sediment transport capacity and successive estuarine outlet extension (EOE), resulting in the breaches of dyke, migrations of courses, decrease of flood conveying capacity，and these mentioned risks in turn can also force the estuary to change outlet with a longterm coexistence of instability, drought, water abandonment and ecowater shortage in the delta. Among the reasons, the authors think that the estuarine layout is a key segment affecting the longterm safety of the LYR under a premise when the floodsediment control system in the river’s midreach cannot sustain in trapping the sediment. A multi outlets scheme (MOS) is proposed to replace the traditional estuarine layout of single outlet and it is studied by applying a new proposed formula for the EOE as a function of flow and sediment condition. The results show that the MOS can inhibit the longterm alluvial accumulation of sediment in the estuary and control the rise of the relative erosion base level, to maintain a stable delta, to control the continuous rise of the mainchannel and its flood levels, to rationalize the relationship between flow and sediment, creating conditions for utilizations of freshwater resources and prosperity of the estuarine wetlands and the pandelta with highquality development.