To reduce construction cost and improve ventilation effect of underground tunnel, the design of large diameter cable vent is an effective means. A cable vent was designed and completed in a cold mine in Lingbao of Henan, the technologies of current vertical hydraulic shaft drill, multistage reaming drilling, borehole deviation control by pilot hole are used, the ventilation, power supply and communication are realized with good economic benefits. The construction experience is summarized in drilling equipments, drilling technology and borehole deviation and the economic benefits are also analyzed.