The double-arch tunnel is built usually by the full-face method under the condition of surrounding rock masses grade II and grade III. Vibration of blasting has been simulated and analyzed by three-dimensional numerical simulation during construction process of the double-arch tunnel; and the influence of blasting vibration on the middle wall of the double-arch tunnel caused by the rear tunnel is studied. The result indicates that the blasting of the rear tunnel creates much effect on the middle wall of the double-arch tunnel; there is a great need for protection to reduce disturbance of middle wall caused by blasting vibration; and temporary support will be destroyed.