Abstract: The dam of Jiayan Water Conservancy Project is concrete faced rock fill dam, the maximum dam height is 154 m. The flood control standard in 2018 adopted 10-year return period flood, which mainly used upstream and downstream cofferdam to prevent water and diversion tunnel to discharge water. The upstream cofferdam is rolled and non-overflow geomembrane central core rockfill cofferdam, the maximum height is 44.5 m, and the maximum storage capacity is 94.89 million m³. Focus on the severe situation of flood control in 2018, this article analyzes flood control standard, engineering measures, organizational measures, monitoring means and emergence plans, so as to ensure the safety of the project in 2018 flood season and the downstream masses.