In response to the limited construction site and large fluctuations in upstream and downstream water levels,the traditional layout types (open and enclosed) of water-saving basins of locks cannot meet the design requirements well.A new layout type of water-saving basins is studied,and the concept of combined layout is proposed.That is,some water-saving basins are horizontally staggered relative to the other part,and some water-saving basins are also vertically staggered relative to the other part.By adopting this layout type,it can not only adapt to narrow site conditions but also adapt to large fluctuations in upstream and downstream water levels,which well meets the design requirements.This layout has been adopted in the support project and has entered the construction phase.This technology can provide reference for the design of water-saving shiplocks under similar conditions.