Abstract: Based on the normal model with the model scale of 1∶100,and considering 8 daily regulation schemes in the cases before and after the construction of the Ganlanba hydropower station,unsteady flows of the Jinghong hydropower station have been simulated.By laying out the measurement stations at the key places controlling the navigation in the 6.4 km long downstream reach of the Jinghong hydropower station,the characteristic parameters of the unsteady flow have been measured and analyzed.The characteristic parameter values such as the maximum daily,hourly and 20 minites’ variation amplitudes of water level have an important influence on navigation and mooring.As a result,this paper has studied the influence of 8 daily regulation schemes of Jinghong hydropower station on the downstream navigation flow conditions.The model test results show that the maximum daily and hourly variation amplitudes of discharge of the regulation schemes are two key factors which have an important role in characteristic parameters of the unsteady flow,and in all cases of the regulation schemes the maximum daily,hourly,and 20 minites’ variation amplitudes of water level decrease gradually in the downstream of the Jinghong hydropower station.The model test results have provided reference for rationally drawing up the daily regulation scheme of Jinghong hydropower station.