Abstract: In the previous aeration researches on the sluice structure,there are many achievements about the free-surface aeration and the sluice aeration,but there are fewer hydraulic tunnel excavation aeration researches.In order to reduce the disad-vantageous impact on the ecological environment,a set of aeration performances were conducted for the hydraulic tunnel excavation.It is found from the experiments that the oxygen transfer efficiency at the hydraulic tunnel excavation is related to Fr and h_t/h.It also reveals that the oxygen-transferable efficiency of the hydraulic tunnel excavation increases with the aerator.It is expected that the results from this study will serve for the improvement of the design of the hydraulic tunnel excavation with high aeration efficiency.