Reduce the blasting vibration is important for blasting excavation in subway tunnel construction. Take the 3rd bid section of Line 3 of Qingdao subway project for example, the distance between tunnel vault and ground is 5~8m, in order to insure the safety of the upper buildings, technologies of parallel cut with big empty hole, one-time initiation and delay by parts, and multiply short holes were adopted in the project. The results show that the maximum value of vertical vibration limited in the criterion allowance, and the upper buildings was intact. Besides, problems of shock conducting tube detonator delay number difficulty to meet large cross-section tunnel blasting excavation requirements, multiple cross-section can’t initiation simultaneous, and low construction efficiency were solved, which ensure the construction safety and schedule.