Taking the two-stage arrangement of double-lane ship locks in the section from Changshan River to the provincial boundary of the Zhejiang-Jiangxi Grand Canal as an example,this paper conducts research on the water-saving and intensive water use guarantee schemes for ship locks.For water-saving in ship locks,the method of mutual filling and emptying between double-lane ship locks is recommended.Through the analysis of water demand of the two-stage double-line ship locks,the theoretical water-saving rate can reach 50%.Considering the ecological water and shipping water demands of the canal,combined with factors such as the amount and distribution of water resources along the route,as well as topography and landforms,the water supply sources are studied and analyzed.Three water security schemes are proposed:constructing new reservoirs within the region,lifting water with pumps within the region,and building reservoirs and diverting water outside the region.Based on the construction content and engineering investment of each water supply guarantee scheme,and after technical and economic comparison,the scheme of lifting water with pumps within the region is recommended for the ship lock water supply guarantee.