Taking the dike retreating planning of Dazong Lake in Yancheng City as a case, dynamic supervision of UAV is performed. Combined with the ALOS satellite images before project implementation, the contents of the original plan are compared. 11 change points are detected using the visual interpretation method. The compliance analysis and the post evaluation of the planning are conducted. The correction recommendations and programs for the problems with different natures are proposed. The results show that the supervision and post evaluation using the UAV remote sensing technology can qualitatively analyze project planning and quantitatively give specific positions and area differences of projects. Furthermore, whether the goal of the original plan can be achieved or not or the existence of difference can be investigated by analyzing the overall planning scheme, and the necessity of corrections or additions can be studied too. The UAV remote sensing technology is suitable for the supervision and management of key water conservancy projects with potential dynamic tracking and monitoring in a wide range.