居庸关位于距北京50公里外的昌平境内。关名取“徙居庸徒”之意。相传秦始皇修筑长城时,将农夫和士兵徙居于此。早在战国时代,燕国就曾扼此口,时称“居庸塞”。汉代沿用此名,其后另有他称。唐代之后沿用居庸关名称至今。明代曾把居庸关、紫金关、倒马关合称“内三关”。此关形 Juyongguan is located 50 kilometers away from Beijing Changping territory. Guan name to take “resettlement home” meaning. According to legend, Qin Shi Huang building the Great Wall, the farmers and soldiers will be resettled here. As early as the Warring States Period, Yan country had briefly this mouth, when called “Juyongsai.” Han followed this name, then he said otherwise. Following the name of the Juyongguan since the Tang Dynasty until now. Ming Dynasty once put the Juyongguan, Zijin off, down the horse off together “within the three off.” This off shape