[Objective] The study aims to predict and analyze the project impacts on the river flood discharging capacity, and provide methods for assessing flood controlling impacts of urban ecological park projects.[Methods] Based on MIKE 21, we constructed a 2-dimension water flow model for urban ecological park section in Weihe River in Baoji City, selected 1954 flooding process to verify the rationality of the model, and simulated three typical flow characteristics of flow field and changes in water level and discuss the urban ecological park impacts on river flood discharging capacity. [Results] Under the three typical flow flooding events, the water level along the river was below embankment and not a threat to urban flood discharging safety, and the flooding safety can be guaranteed. But as a result of flooding passage narrowing and increasing velocity, the erosion of the embankment was intensified, and reinforcement measures was urgently needed. [Conclusion] The river shape will affect the flow regime. The higher water flow speed will affect the stability of embankment structure thus influencing the river flood discharging capacity.