The Fangshuihe aqueduct is currently the largest aqueduct in China with a water discharge cross-section size. The groove wall is thin, the concrete grade is high, the hydration heat is high, the insulation temperature increases, and the structure is complex. The article discusses the measures to reduce hydration heat by embedding cooling water pipes inside concrete; At the same time, cooling measures such as aggregate pre cooling, ice water mixing and spray on the warehouse surface shall be taken for construction in summer; During winter construction, insulation measures such as blocking and extending the time for formwork removal were taken, achieving good results