The invention discloses a process for mounting gas pipelines of gas vertical shafts. The process includes steps of (1), excavating the gas vertical shafts; (2), downwardly releasing gas pipes; (3), blocking the bottoms of annular spaces between the walls of the gas vertical shafts and the walls of the gas pipes. The process has the advantages that the construction periods of the gas vertical shafts can be shortened, the construction cost of the gas vertical shafts can be reduced, and conditions for effectively solving the problem of difficulty in filling the rears of the walls of existing gas vertical shafts can be created.