Abstract: The subsea test tree is a key risk control equipment in deep water testing process. Under the emergency condition，it is
quick to disconnect test column，plug the downhole string within the high-pressure oil and gas in order to achieve the protection
of test equipment and personnel safety and to avoid pollution of the marine environment in special sea conditions. Through
extensive literature data collection and on-site research，we analyze the subsea test tree research status at home and abroad，
detailing the functions，structural features of foreign subsea test tree，applications，and domestic subsea test tree development
and application at home. The comparative analysis shows that：the foreign subsea test tree is the powerful，reliable for different
conditions，and products by different companies we discuss have their own characteristics in structure and function. At the same
time，with reference to the research and development process of the application status of domestic subsea test tree，problems
that may arise in subsea test tree in China，and we explore the feasibility of subsea test tree production in China，too. We believe
that this paper is of significance to research and development and manufacturing of China’s offshore oil subsea equipment.

Key words: deep water test, subsea test tree, at home and abroad, research status, localization, design ideas