The Gan-Yue Canal is an important component of the third vertical Zhejiang-Jiangxi-Guangzhou channel in the national high-level waterway network "four vertical-four horizontal-two networks" planned by the National Comprehensive Three-dimensional Transportation Network Planning Outline. Whether the canal shipping water can be guaranteed is one of the important questions that must be answered clearly. Starting from the general situation of the Ganjiang River and Beijiang River basins involved in the Gan-Yue Canal and the basic situation of water resources development and utilization, according to the prediction of the number of gates passing through the Gan-Yue Canal and the layout scheme of the ship lock, the daily average theoretical water consumption calculation of the ship locks of each cascade hub of the canal was carried out so as to calculate the shipping water consumption and water shortage of the Gan-Yue Canal. Combined with the "Jiangxi Water Network Construction Plan", the combination scheme of normalized daily water supply of step-by-step cyclic water lifting + emergency water supply of Jifu Reservoir ( Chongxian Dam Site ) was recommended. This paper holds that the scheme of taking corresponding measures, such as water-saving technology for locks, step-by-step water lifting, and water replenishment for reservoirs, can meet the water supply demand of the cascade of water shortage hubs and solve the problem of insufficient shipping water resources in Gan-yue Canal Project. Finally, the research directions for deepening the water supply guarantee plan of shipping have been proposed.