The application of local dispersed filling & emptying system in the low-medium head lock not only has the advantage of less structural engineering quantity, but also keeps the characteristics of favorable flow condition, guaranteeing the berthing condition of ships in the lock chamber, and the engineering cost is lower. It can reduce effectively the wave force in the lock chamber during water filling without extending the filling and emptying time, so there is no need of setting a mitigation segment in the chamber and the lock capacity is improved. The local dispersed filling & emptying system provides a new design mode and may serve as a supplement for the revision of the Design Code for Filling & Emptying System.