Abstract: Lashing bridge is a special structure of a container ship, and its construction quality directly determines whether the packing test can be carried out smoothly. Based on the 21 000 TEU ultra large container ship project under construction by Shanghai Waigaoqiao Shipbuilding Co.， Ltd.， We carry out systematic investigation on the key processes 〖JP2〗of the construction of the lashing bridge structure, including and the requirements for the drawing of the ground lines, the design and layout of the bed-lines, and precision control during the overall group construction. This research provides technical support for the high-quality construction and installation of 21 000 TEU lashing bridges.