介绍了日本建筑环境工程领域的数值模拟技术概况，计算流体动力学（ＣＦＤ）在暖通空调上的应用程度、领域、对象、软件硬件、计算规模、解析方法等情况，给出了若干应用实例，指出了近期的研究动向及今后课题。 This paper introduces the overview of numerical simulation techniques in the field of Japanese construction environmental engineering, the application of computational fluid dynamics (CFD) on HVAC, the fields, objects, software and hardware, calculation scale, and analytical methods, and gives several application examples. , pointed out the recent research trends and future issues.