Abstract: In the landscape architecture discipline, the evolution process of river landscape in long time and space is seldom considered in riverside planning and design. The cognition of the evolution rules can make the design schemes more scientific. This research takes the Caersws reach of the Severn River in the UK as an example. Based on the CAESAR-Lisflood platform with a comprehensive cellular automata model and fluid dynamics model, it carries out the evolution prediction on the spatial and temporal dimensions of the curved river channel landscape, the analysis of the multi-scenario changes of floods in the flooded areas, and the numerical simulation of the ecological flood control measures. It has been found that the village basin in Caersws has a large water inflow and strong river transport capacity, which gradually elevated the riverbed over time, and is prone to flood disaster and river diversion. The village is at high flood risk, and the comprehensive flood control benefit of setting spur dikes is the best option. This research first introduces the CAESAR-Lisflood model into the application of the landscape architecture, and creatively proposes that the simulation study of river landscape evolution could make the setting of flood control measures more accurate and controllable, and provides new ideas for the setting and comparison of the planning schemes, so as to guide the landscape planning of green space along the river.