Aiming at the problem of safe-operation of the floating gate against ice damage in the freezing period in extremely cold area，taking the large floating gate in the Far East of Russia as an example，this paper develops the gate external bubble anti-freezing system，auxiliary electric heating system，water stop anti-freezing system，external anti-freezing detection system and melting ice monitoring system，internal water tank anti-freezing system，which can make the floating gate still operate normally and safely under extreme climate conditions.The successful development of the gate makes it possible for ships to pass normally in the port area in the extremely cold area under extreme working conditions.It expands the water area for the site selection of the port area，improves the utilization rate and turnover rate of the channel，and reduces the shipping cycle and cost.