The Yushan green petrochemical base in Zhoushan is an important component of China's seven major petrochemical bases，and also the first petrochemical base to build a green development benchmark in the country.The construction of liquefied natural gas (LNG) terminal is very important for the development of the base.We explore the advantages of water areas to reasonably set up the movement safety zone for LNG ships as 1 n mile in front，0.5 n miles behind，and 300 meters in each side，reserve a 360 meters wide channel for opposing ships，and solve the problem of opposing containment during the navigation process of LNG ships.By using the substitution method，we conduct a quantitative analysis on the number of ships that need to be coordinated and avoided during the entry and exit process of LNG ships，vividly depicting the traffic scene after the construction of the LNG terminal.Through three-dimensional modeling of the Daishan North Channel Bridge on the Shanghai-Ningbo Channel，LNG ships，and surrounding water areas，we use maneuvering test methods，and propose that the safety distance requirements for the turning point of the LNG dedicated channel and the cross sea bridge should not be less than 6 times the length of the ship.