The determination of the slope revetment top elevation often has a great impact on the overall cost of revetment project. In this paper，based on the engineering example，revetment top elevation is analyzed according to the theoretical formula，in which the control standard of overtopping is mainly analyzed. After determining the revetment top elevation according to the control standard of overtopping，the action distance of overtopping tongue is further analyzed. Finally，the theoretical calculation results of overtopping and action distance of overtopping tongue are verified according to the physical model test. The analysis results show that：1）For the slope revetment top elevation，the reasonable overtopping control standard should be determined according to the actual protection function. 2）At the same time，the action distance of overtopping tongue should be analyzed to provide the basis for the site layout behind the revetment.