The floating overhaul gate of Gezhouba navigation lock (the floating gate) is an important part of the maintenance equipment and facilities in Gezhouba navigation lock,which plays a downstream water retaining role in the overhaul of Gezhouba navigation lock during the stopover period,and provides an anhydrous environment for the overhaul projects of the lock chamber corridor and the downstream miter gate.Quick and accurate alignment of floating overhaul gates of Gezhouba navigation lock is the basis of improving the efficiency of overhaul of Gezhouba navigation lock during shutdown period.The rapid and accurate alignment of floating door can be divided into three steps: floating door body entering slot,door body alignment and rapid sinking and floating.By analyzing the current situation of alignment of floating overhaul gates of Gezhouba navigation lock,starting with the influencing factors of floating gates,the rapid and accurate alignment of floating gates about Gezhouba is analyzed.