Abstract: The three-dimensional dynamic visualization of flood evolution can provide theoretical basis and decision support for flood disaster prevention and rescue and relief. The flood depth map of two-dimensional can determine the position that needs to be guarded against,but the display effect is not stereoscopic and intuitive enough. Based on Cesium 3 D terrain engine,CZML can display the flood inundation process in a three-dimensional and dynamic manner. However,the numerical simulation results cause discretization of computing units,which greatly affects the user’s perception,and the real-time loading and rendering of the flooded grid results in a certain degree of page lag.Combined with the new technology of HTML5 named Canvas,the inundated grid is uniformly colored as a whole,and the front-end rendering pressure is reduced by the way of background cache,which can greatly improve the visual effect of flood evolution and improve user experience.