As the main deck of the cargo hold of the chemical tanker is an overturned structure, the design of the foundation of the hose crane often causes the interference between the circular cylinder of hose crane and the longitudinal, longitudinal girders and web beams on the deck, which brings many inconveniences to the design and construction in the future. This problem can be solved by designing the "tian yuan di fang" joint on the foundation to connect with the longitudinal girders and web beams on the deck. It calculates and checks their strength through the finite element method. Some issues that are related to the design of the “tian yuan di fang” joint are discussed. This method can provide certain reference for solving the relevant engineering design problems.