Research conclusions: By making theoretic analysis，numerical simulation，in － site test and conducting the advanced geological forecast，the deep study was done on the key technologies，including the risk management of construction of submarine tunnel，construction for the fault fracture zone，construction of the shallow crossing large span，construction of rooms with small clear distance，construction of crossing chambers，and rapid construction with boring blast method． The construction risk management information system was set up． The double － channel grouting device and the new technique of the rapid curtain grouting without grouting stop wall for the fracture rock ( fault fracture zone ) were developed． The construction technologies for plane crossing chambers and stereoscopic crossing chambers were optimized and the set complete technology of the boring and blast was summarized for promoting the progress of the Chines technology for construction of submarine tunnel．