Abstract: In the field of offshore energy project construction, the construction scale of offshore voltage source converter-high voltage direct current (VSC-HVDC) converter station is continuously expanding. During the floatover installation of the topside, the eccentric center of gravity effect may have a great influence on the dynamic response of the installation process. Dynamic response of the topside of offshore VSC-HVDC converter station during the floatover installation process considering eccentric center of gravity was mainly studied. Five different conditions were selected for numerical simulation by using OrcaFlex software to analyze the motion response of the vessel and topside, and the load on the fender system during the floatover installation process. Results show that different degrees of eccentricity in the center of gravity result in obvious differences in both the force distribution on the fender system and the motion response of the vessel and topside. When the topside of converter station exhibits a center-of-gravity shift, balancing measures effectively reduce the motion response of the vessel, decrease the force imbalance of jacket pile leg mating units, and lower the fender impact intensity. It provides an important reference for the floatover installation project of the topside of offshore VSC-HVDC, which has positive significance for promoting the development of offshore energy construction.