| Mine ventilation system is one of the life-safeguard system, its working reliability has special meaning. It is important to retain the stability of airflow, i.e. to retain the quantity, quality' and direction of airflow consistant all the time. In this paper, main factors which influence the reliability of ventilation are studied. From analyzing the variety of airflow quantity, a computation expression of airflow reliability is given. From this, every branch's reliability can be computed, in consequence network's reliability can be computed too. And the computation expression of airflow validity is given. Branch sensitivity and its attenuation ratio are emphases studied in this paper, and its compute course is calculate minutely. In the paper, it also analyzes the apply of sensitivity, sensitivity' quality and sensitivity' attenuation ratio.
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