This project is situated on limestone and its construction environment and condition are extremely difficult. The dock is 365m in length, 80m in width and 12.7m in depth and is the largest in mainland China. It is used for build 300,000T ultra-large ship and special marine structure. The dock is with pressure-reducing and drainage structure carried out by dry construction. It is of gigantic scale and complicated structure. The outfitting quay adopts high pile and beam-slab structure with cast-in-situ pile foundation and it is with a length of 420m width of 22m and top elevation of +5.2m.