This paper introduces in detail a large inverted T type dock gate which is designed and developed for the first time in China. The inverted T type dock gate can be used normally in the extremely cold area. This paper expounds the design idea from the aspects of equipment requirements and working conditions. The inverted T type dock gate described in this paper is the first inverted T type dock gate designed and developed in China, which is used in extremely cold areas. It is an initiative and has great reference value for the design and development of similar equipment products in China in the future. It has not been mentioned in previous literatures that the dock gate can be operated in low temperature environment. In fact, in winter of cold regions, the dock gate can only be in a static water retaining state because the water is frozen. All kinds of anti-icing systems equipped with the inverted T type dock gate are designed and used for the first time, which can meet the anti-icing requirements under different ambient temperatures and make the dock gate can be used normally in the freezing period.