Considering its simple structure , low cost, energy savings , little noise, small amount of maintenance and adaptability to normal vent , cold air distribution induction scaling duct is spoken highly of .But it is not easy to reach a high induction ratio .In this paper , CFD software was adopted to simulate internal fluid properties in the in-duction ducts .Then secondary air inlets were located in the position with the lowest static pressure after the analy -sis of the contours .Finally, the induction ratios for different ducts were calculated .After comparing induction rati-os, the optimal location of secondary air inlet is determined and the absorption section is designed .%低温送风诱导式缩放风管具有结构简单、造价低廉、节省能耗、噪声低、维修工作量小和能利用普通风口等优点，但不易达到较高的诱导比。运用CFD软件对风管内部流体特性进行模拟，通过云图进行压力分析，并在云图静压较低处对应地设置二次风口。计算各种情况下诱导风管的诱导比，通过诱导比计算值的对比，确定出二次风口的最佳位置，设计出诱导式缩放风管的吸收段。
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