According to the module characteristics of 350 000 t FPSO, the ultra-long ultra-narrow ultra-high pipe gallery module, electrical module, connection node between the hull and the module, informatization, etc. are studied. The key technologies of construction such as section construction, integrated construction, transportation frame design, connection node process, refined management process, etc. are summarized and other matters of module construction are described, which are proposed as technical reference for the similar projects.