In this paper, the dispersion processes of heavy gas in the typical rooms under upwind and leeward con-ditions and with leaking holes in different positions were simulated and compared. The results showed that the height of leaking hole has the most significant impact on the dispersion process of noxious heavy gas in the room with a single leaking hole under upwind condition;the heavy gas disperses slowly in the room with a single leaking hole under leeward condition and the room is relatively safe; and the heavy gas disperses fastest in the room with leaking holes in both front and rear walls, which is most dangerous to the persons in the room.%模拟了泄漏场内典型房间的重气扩散过程。对比了不同泄漏孔位置及泄漏孔迎背风条件下房间内重气的扩散情况。数值模拟结果表明，当单一泄漏孔存在且泄漏孔迎风时，泄漏孔在高度方向上的尺寸对有毒有害重气在室内的扩散过程影响最为明显；当单一泄漏孔存在且泄漏孔背风时，房间内重气扩散缓慢，房间内相对安全；当前后墙都存在泄漏孔时，重气的扩散是最为迅速的，对于室内人员来说，这种情况也是最为危险的。
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