The tunneling length of single face of Bohai Strait tunnel increases to 25 km due to the arrangement difficulty of the vertical shafts. The construction ventilation of Bohai Strait tunnel is studied in terms of ventilation mode selection, ventilation calculation and facility selection, on the basis of the existing devised program. In the end, the gallery-type ventilation method is proposed to solve the ventilation problem of the mentioned tunnel. The paper can provide ventilation technical support to the study on Bohai Strait tunnel.