Abstract: Based on the mathematical model of parallel fan operating，the change law of equivalent wind resistance of parallel fan was analyzed.Condition of minimum fan total energy consumption can be drawn from the point of energy-saving.Taking the mine ventilation system of Tonglushan as an example，the operating point change law of parallel fan is studied.Studies show that: Selection of parallel fan needs to comprehensively consider the matching relationship among the air pressure，the air volume and the parallel fan;It is very difficult to control air volume in a mine ventilation system of parallel fan;The air door and air partition play an important role in air flow distribution.The key in routine ventilation management lies in the air door and the balanced demand air volume.

Key words: Parallel fan, Joint operation, Effectiveness analysis, Operating point optimization