Abstract: As one of the main oil and gas platforms in deep water, tension leg platform (TLP) has been widely applied in recent years. Marine system is very important for the stability of TLP by adjusting the tension. Based on the design standards and Liuhua TLP FEED project design work, we review the piping design principles, and basis, layout requirements of marine system for TLP, and introduce the hull piping design practice for ballast/deballast, bilge/stripping, vent/sounding system, etc. This research can provide some reference for TLP hull piping system design.