Taking the construction project of Paipu Central Fishing Port as an example，this paper explores the influence of the planar layout of water exchange channels on water exchange through different combinations of two basic water exchange channels by using a two-dimensional hydrodynamic model and water exchange mathematical model.The results show that the arrangement of only channel 1 is beneficial for speeding up the water exchange in front of the 1 000 t fishing vessel berth，but it slows down the half-exchange period of the water in front of the berth on its left side，especially near the breakwater root.The arrangement of only channel 2 is beneficial for improving the water exchange efficiency near the breakwater root.The arrangement of both the two channels is beneficial for not only enhancing the overall water exchange capability of the medium-sized fishing vessel berthing area and the front of each berth around it，but also improving the water exchange efficiency near the breakwater root.