Due to the matching operation of Gezhouba No.1 Lock and the Three Gorges Lock,ships are docked at the navigation wall,the first downwards ship at the upstream navigation wall is close to the miter gates,and the ship after entering the lock is also close to the downstream miter gates.In both cases there are risks of colliding with the miter gates.For the existing risk,the possibility of adding anti-collision facilities for the upper and lower miter gates is analyzed combining with the upper head and lower head in the lock,and three schemes are proposed,i.e. the lifting scheme,the side-opening scheme,and the sinking scheme,the possibility,advantage and deficiency of which are discussed and reference is provided for the design and application of the collision safety device of the miter gate.