Abstract: For the safe operation of South-to-North Water Diversion Project, ice jam prevention of inverted siphon and other partial hydraulic structures is very important during the period of an icing event. The ice jam process at the entrance of inverted siphon is simulated by ice-hydrodynamics experiments under real ice conditions. The hydraulic conditions of ice jam prevention are obtained. Using the experimental data, the water diversion capacity and control regulations of inverted siphons for the Beijing-Shijiazhuang section of South-to-North Water Diversion Project are analyzed. This study provides a valuable reference for the safe operation of the project during the period of an icing event.