Abstract:Taking the water replenishment project of Longjinyangqi Water System of Cangshan in Fuzhou as an example, combined with the regional characteristics of the project, the MIKE 11 model suitable for the plain river network area and able to flexibly dispatch the hydraulic structures is adopted to simulate the water replenishment schemes under the different working conditions. The proposed scheme of water replenishment is to carry out natural moisture replenishment during the wet season and the water replenishment direction is the diversion from south to north. Due to the insufficient tide power of Minjiang River in dry season, the pumping stations should be used to replenish water and the water replenishment direction is the diversion from east to west and from south to north. The obtained conclusion can provide the guidance for the later operation and maintenance of water system.