古人休息的床榻多用木、土制成。南方多用竹木作床,轻巧凉爽,而北方则多用泥土砌床,方便实用。至晚在晋代,已经有了“土床”的术语。用土盘炕,就地取材,几乎不必花费什么开支,所以非常受百姓的喜爱。因为北方天气寒冷,所以人们便在日常经验中逐渐发明火炕,它的历史已有上千年了。据宋代的《三朝北盟会编》第三卷记载说:北方“环屋为土床,炽火其下,而寝食起居 Rest ancient bed with wood, soil made. In the south, bamboo is used as a bed, which is light and cool, while in the north, soil is more used for making clay, which is convenient and practical. Until late in the Jin Dynasty, there is already a ”bed“ term. With soil plate kang, local materials, almost no need to spend any expenses, so very popular with the people's favorite. Because of the cold weather in the north, people gradually invented the kang in their daily experience, and it has been around for thousands of years. According to the Song Dynasty, ”the three North Koreas will compile“ Volume III records said: North ”ring house for the soil bed, blazing its next, and sleep daily living