In this study, the floatover technology applicated in platform engineering, fabrication, installation and specific equipment, acility is briefly introduced, through the study of offshore 10000-T class topside floatover technology, and integrating successful application of varied technology in LD27/232/2 oil field development in Bohai Bay. It will be used in guidance of application in 10000-T topside float-over technology in Bohai Bay, and support the application in South China Sea oil and gas field development.