According to the actual demand of the first self-developed subsea capping stack in China,a new hydraulic connector was developed,which had a triple unlocking mechanism with mechanical and double hydraulic drive unlocking,a fast switching locking mechanism with HC type and H4 type hydraulic connectors, a primary and secondary redundant sealing structure design, and a hydrate suppression structure at the top and bottom of the connector, etc.It is suitable for deep water conditions above 3 000 m. The connector has important economic and social benefits. It provides reference for domestic research and development of subsea hydraulic connectors.