敞开楼梯间广泛应用于多层建筑,但其安全性能较低,且现行相关规范对敞开楼梯间的通风排烟规定比较笼统。本文采用FDS软件,以某教学楼为研究对象,比较了不同窗户开口模式下建筑物内部的烟气蔓延情况,得出敞开楼梯间内自然排烟窗口设计的最佳方案。 Open stairwell is widely used in multi-storey buildings, but its safety performance is low, and the current relevant norms on the open stairwell ventilation and exhaust provisions more general. This article uses FDS software to take a teaching building as the research object, compares the smoke spread inside the building under different window opening patterns, and draws the best plan to open the natural smoke exhaust window design in the stairwell.