Abstract: Temporary support is widely used in coal mine rapid excavation face, hydraulic synchronous system can improve the synchronization of column cylinder. Aiming at the cavitation phenomenon of synchronous valve in synchronous system of temporary support in roadway, the multiphase flow model of valve cavity was established by fluent. The influence laws of different parameters (number of valve ports, diameter of fixed throttle ports, distance between double row valve ports, number of valve ports) on the cavitation intensity and distribution in the valve chamber was studied. The optimal values of each parameter were obtained by optimization. The results show that when the synchronous valve adopts a double-row mechanism, the diameter of the fixed orifice is 6 mm, the distance of the double-row orifice is 10.5 mm, and the number of orifices is 12, the maximum volume fraction of vapor phase is reduced by 24 % compared with the initial flow field in the valve chamber, the cavitation area is reduced, and the cavitation resistance is enhanced.