Based on the design experience of subsea umbilical termination unit (SUTU) in Wenchang 10-3 project, the challenges and relevant technologies, which focus on the system integration design and characteristics of supply equipment, are analyzed and summarized. The SUTU system design was completely controlled by foreign supplier before. The design mode adopted in Wenchang 10-3 project will improve our independent research and development capacities, reinforce the localization of technical reserves, and provide a good basis for the future deepwater oil and gas development.