Abstract: The middle and later periods are a special time for alum mines, when the mine ventilation system will face more complex problems.In light of the production practice of mines, the status quo and problems of underground ventilation system in alum mines are analyzed.Measures for solving the safety problems in the underground ventilation system of Wenzhou alum mines in middle and later periods are proposed from the optimization technology and safety management of ventilation system, aiming to reduce the safety accidents and ensure the smooth operation of underground mining.

Key words: Alum mines, Middle and later periods, Ventilation system, Safety issue, Countermeasure