Abstract: Risk control of high rock-fill dam construction in flood season can be achieved by appropriate dam filling schedule. This study has introduced an adaptive control theory to the development of a water retaining risk dynamic control model and the design of control schemes on high rock-fill dam construction. The flood hydrograph is simulated by a first-order autoregressive time series model using measured flood series, and real-time risk can be calculated. Then, the rock-fill dam filling progress is adjusted dynamically by limiting the real-time risk to the accepted risk range, which can be taken as a desired trajectory on account of the risk preference of decision-maker. By such a dynamic adjustment, the real-time risk as entire trajectory will aim to track this desired trajectory to maximum coincidence. Application to a practical case shows that this dynamic control model can effectively control the risk to the expected target and explain why the maximum cost that the decision-maker is willing to pay tends to be stable in late flood season. This study provides support for the progress control and flood protection decision making.