Bijiashan tunnel on newlybuilt WenzhouFuzhou railway is a supershallowburied tunnel with large crosssectional span, extreme shallow cover and soft surrounding ground, which passes underneath expressways and national highways. On basis of comparing and constant optimizing of the construction schemes and construction methods during the construction, optimized CRD method is adopted for tunnel construction. At the same time, information feedback is made on basis of monitoring to provide dynamic guidance for the tunnel construction. The tunnel has been completed successfully. Discussion is made on the construction technology for the supershallowburied tunnel passing underneath expressways and national highways in the paper, which can be served as reference for similar projects.