Taken a decommissioned mid-water buoy gravity base of Floating Production Storage and Offloading (FPSO) in an oil field as the research target, the static and dynamic lifting analysis is conducted to inspect the ability of the pedestal crane of the working ship. The structure analysis of the gravity base’s lifting point and whole structure is performed. The interaction between the gravity base and soil and the uplift force are analyzed and the operation advice is given. The results show that the crane capacity can meet the requirements of demolition and lifting operation, the lifting point and overall structure of the gravity base can meet the requirements, and the lifting force of the gravity base exceeds the maximum capacity of the crane without soil treatment. Several measures should be considered to keep the whole removal operation safety.