Abstract: As for the running tunnel section between Wuyuanwan station-Liuwudian station of Xiamen metro line 3, the construction method of " dismantling shield machine in the subsea and continually excavating the rest of section by the D&B method" is adopted. It is required to overcome such technical difficulties as shield disintegration in a confined space, long-distance single-line transportation, long-distance blind ventilation, protection of formed segments, waterproofing of joint structures, etc. The paper systematically expounds the transfer technology of various construction methods in Wuyuanwan station - Liuwudian station section and mainly introduces the solutions to the above construction difficulties. It has been proved in practice that this technology can greatly improve the construction progress under the premise of guaranteeing construction safety and structural function completeness, having reference significance for the subsea tunnel constructed by multiple combined methods.