The high waterhead hydropower station takes water to generate electric power in heavily sediment-carrying rivers, water taking and sediment prevention are the key technologies that the hydropower station needs to solve. This was gradually achieved through a variety of programs for model test selection. The results showed that, the combination of the spur dike with open channel diversion tunnelwere the recommended scheme, with the extending of open channel diversion tunnel to the center of the reservoir river and covering plates, according to the flow movement regimes to set the layout of spur dike utilizing the topography of open channel diversion tunnel and the diversion tunnel operation role, a complete flushing sediment hopper were constituted. Water and sediment were separated in the hopper, the separated sediment were discharged to the downstream through the diversion tunnel, sediment at the upstream of spur dike was relatively small, there was almost no downstream riverbed sediment transport to downstream, which assured a clean sediment envrionment before the power plant water-uptake door, so the recommended scheme was both economical and reasonable.