古人休息的床榻多用木、土制成。南方多用竹木做床,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,而寝食起居其上谓之炕以取其暖”。这里的土床就接近于火炕。人们在屋子里用泥砌成土床,里面是空的, Rest ancient bed with wood, soil made. South bamboo bed with more, light and cool, while the north is more use of earth puzzle bed, 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, “Three North Korea Association ed.” Volume III records, said the North “ring house for the soil bed, blazing its next, and sleep on its so-called kang to take its warm.” The soil bed here is close to the kang. People in the house with a mud bed into soil, which is empty,