With the advancement of large-scale ships，some locks are unable to meet the safety mooring of ships passing through the locks.Taking the first-line lock in Zhuzhou as an example，this paper upgrades and designs the floating bollards under the premise that the floating bollard groove remains unchanged.By changing the type of floating bollard structure，optimizing key parameters such as mooring height，pontoon diameter and draft，the mooring force is increased to 100 kN，and the height of the double-layer mooring is increased to 1900 and 3 700 mm，respectively.After finite element analysis and verification，the strength and stiffness of the mooring frame structure meet the requirements.The engineering practice shows that the boundary parameters of the modified floating bollards are reasonably matched with the size of the well，the operation is reliable after putting into operation，and the unplugging effect of the ship mooring cable is good，which can provide reference for the upgrading and transformation design of floating bollards in similar lock projects.