To explore the influence of heavy rainfall on the lateral seepage characteristics of permeable ship lock chambers,this paper adoptes the ANSYS thermal analysis module to establishe a two-dimensional mathematical model of permeable ship lock chamber,considering the irrigation and drainage for navigation,and studies the seepage characteristics of permeable ship lock chambers under no-rainfall and multi-level rainfall conditions.The results show that under no-rainfall conditions,the seepage pressure head at observation points shows a stable periodic variation state after the chamber stable operation,the seepage pressure head amplitude and permeation gradient at the observation points far from the chamber are small.Under light rainfall conditions,the permeability characteristics of the chamber changes insignificantly.However,under heavy rainfall conditions,the seepage pressure head of other observation points rises significantly,except for the observation points controlled by the water level in chamber.The increase and attenuation of the seepage pressure head deviation lag behind the rainfall process.The permeability characteristics of the observation points behind the gate wall change significantly,the seepage pressure head deviation reaches 2.36 meters,and the maximum permeation gradient ratio reaches 2.33.The heavy rainfall has a significant impact on the permeability characteristics of permeable lock chambers and the impact is a hysteretic nature,the seepage characteristics of the soil behind the gate wall are more affected by heavy rainfall.