Among others, the estuary improvement and flood risk management are the important components for the regional development of Yel ow River Delta. During the past few decades, extensive infrastructures, hydraulic engineering projects, dikes, levees and other flood management facilities have been built throughout the region, which safeguard the region from devastating flooding events. However, flood risks remain as the natural characteristics of the Yel ow River, such as siltation, river course extension and diversion, remain intact. As economy grows and climate changes, there is an increasing trend of flood risk. Climate change wil lead to more extreme weather events such as floods, floods induced river course shifting, and strong sea storm surges, etc, In response to the current flood risks faced by the region, this study proposes strengthening water and sediment regulation and sediment reduction in the estuary, extending the life-time of existing river course, while planning an alterna