前言　　多年来，古建筑行业中一直存在着一个问题，即关于古建筑屋面的重量，一直缺少详细、确切的数据。这给结构设计和文物修缮工作带来了一定的困难。由于没有准确的数据做为依据，一些单位在进行结构设计时往往将屋面荷载取定成一个很大的数值，如将每平方米的屋面重量定? Foreword Over the years, there has been a problem in the ancient construction industry that there has been a lack of detailed and accurate data on the weight of ancient building roofs. This has brought certain difficulties to structural design and cultural relics repair work. Because there is no accurate data as a basis, some units often set the roof load to a very large value in the structural design, such as setting the weight of the roof per square meter.