Abstract: With the development of deepwater oil and gas fields, subsea production system is playing a more and more important role. With the limit of water depth and transport distance, subsea production system is operated by automatic control system with umbilical. Various tests are needed during manufacturing, transportation, installation and pre-commissioning in order to keep the reliability of control system. Based on some subsea production projects in the South China Sea, brief introduction is given for the unit test, factory acceptance test (FAT), interface test, integration test and pre-commissioning of the subsea equipment including Christmas tree and subsea manifold. This research could offer reference for other similar projects.