下行通风(Descentional ventilation)是指风流沿采煤工作面由上向下流动的通风方式。当采煤工作面进风巷道水平高于回风巷时，采煤工作面的风流沿风流倾斜向下流动，称下行通风。
回采工作面下行通风在我国许多地方的不同条件下均有使用。
The stope downward ventilation technique has been used under different conditions in many places of our country.
但下行通风在发生火灾时往往会引起风流紊乱，容易造成风流逆转。
However, when the fire happens, the downward ventilation can often cause the air disorder and air inversion easily.
对下行通风时瓦斯涌出及下隅角瓦斯减少的原因进行论证，对上行风改为下行风应注意的问题进行了论证。
This paper discussed methane emission, the reasons for methane reduction in up corner, problems should be considered in the condition of change from normal ventilation into downriver ventilation.
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