Abstract: It is of great significance to study the drift paths of floating algae in the sea area near the nuclear power plant for the security of cooling water intake. According to distribution characteristics of drifting algae in the Eastern Liaodong Bay, this paper builds two-dimensional hydrodynamic and particle tracking numerical prediction model for purpose. The hydrodynamic model is verified based on the current and tidal level data observed on actual observations in recent years. According to the data collected by Beidou and GPS buoys released from May to August 2019,the drifting path of algae in the sea area is verified under the same working condition with good results. At the same time,the risk of algae blockage in the sea area near the intake was simulated and analyzed during spring tide in July, and the time for algae drifting to the defined warning area off the water intake was obtained in different conditions. The results show that the numerical model can precisely simulate the drifting path of drifting algae, which can provide technical support to avoid or effectively reduce the risk of algae entrapment at the water intake of nuclear power plant.