Taken a large float-over topside in shallow sea as an example, the topside loadout analysis is conducted. The topside loadout model is built using structural analysis software SACS, and the structural strength is checked under the loadout design load. The finite element software Abaqus is used to analyze the stress of the slipper to ensure its strength. The stability of the barge is checked using MOSES software, the result shows that the loadout scheme can meet the requirements of the float-over installation safely and effectively. This study can provide technical support and certain reference for the subsequent loadout design of large topsides and other offshore structures in shallow water, both at home and abroad.