Taken Offshore Oil 119 Floating Production Storage and Offloading (FPSO) as the research object and compared with the traditional technology of the second docking support laying aside, it is a great challenge to control the deformation and positioning accuracy of the moon pool area after the hull finishes the second docking support laying aside because of the use of hull integrated Ship Interpret Turret (SIT) system. Combining the actual second docking support laying aside experience of the hull, the accurate docking support laying aside of Offshore Oil 119 FPSO finally come true after carrying out the positioning and leveling preparation before docking, checking the towing force of the tug, formulating the tug displacement steps, and developing the detailed process of docking and docking support laying aside. The engineering practical experience can provide reference for the accurate docking support laying aside of large FPSO in the later stage.