讨论了风机置于建筑上部的多点加压送风系统的设计，通过数值拟合的方法得出送风管道中的风速分布，证明风速与加压风机的流量、送风管道的截面积以及管道的高度有关，这对高层建筑加压送风系统的设计有着重要的意义。

By experimental and computer simulation study, a design for pressurization system in a multiple injection system with upper injection is discussed and the velocity in duct is found by approach method. This velocity has a relation with volume flux from pressurization fan, section area of pressurization duct and height of duct. In factual situation, there is an important assistant meaning on researching the design of pressurization system in tall buildings.