为了对通风系统的稳定性进行全面的定量分析，对影响矿井通风系统稳定性的各个因素进行分析， 其中矿井提升系统产生的活塞风速是主要因素之一。通过在井筒中取不同的过流断面，应用非恒定流贝努 利方程和连续性方程，建立矿井提升系统中活塞风速的非恒定流计算公式。定量计算罐笼（箕斗）在井筒中 快速运动时所产生的活塞风速的大小，为进行矿井提升系统对矿井通风系统稳定性的定量分析提供基础数据，从而进一步分析矿井通风系统的稳定性，确保矿井通风系统满足生产的需要，利于安全生产。

It is necessary to analyze each factor that affects the stability of mine ventilation system in order to comprehensively and quantitatively analysis the stability of mine ventilation system. Piston wind velocity engendered by hoisting system is one of the primary factors. Using Bernoulli equation and continuity equation of non-steady flow, the paper presents the calculation formula of piston wind velocity in mine hoisting systems by assuming different passing section. According to the formula, piston wind velocity can be quantitatively calculate, which will be used as basic data for the stability analysis of mine ventilation system. In this way, the stability of mine ventilation system can be further analyzed, which will benefit the safety of productien.