Drastic fluctuations of water level caused by peak regulation and flood discharge in the upstream affect directly the safety of berthing and terminal operation in the downstream vertical piers.A new floating mooring device based on the lock floating bollard provides a solution to the above problem.To verify the reliability that the mooring device can lift up and down freely under complex running resistances，this paper makes further study on the mooring device about one system and multi-system cases，and a group of guide-wheels and a linkage are proposed respectively to solve the stucking problems caused in the two cases.This study lays a solid foundation for the mooring device used in the actual project and serves as reference for similar projects as well.