It is inevitably to cause some influences on the stability of the existing building structures when the tunneling passes under the existing urban buildings. Taking the tunnel connected with the transit expressway in the east passing under the existing houses as the engineering example, combined with the engineering hydrogeological condition of the tunnel and the house appraisal report, the reasonable reinforcement scheme and the electric power relocation mode are used for the cracked houses, which can ensure the house structural safety and power supply safety during the tunneling.