1前言从国家级文物保护单位交河故城的南门进入城区后不远,就可以看见望台遗址。这座建筑是用整个山丘挖掘而成,在以“减地成墙”的建筑方法建造城市而闻名中外的交河故城中,它不但墙体,而且连屋顶都是挖掘而成的。因此,对于研究交河故城的建筑建造方法具有典型的意义。 1 Foreword From the national heritage conservation units pay the ancient city of South Gate into the city not far after, you can see the Observatory site. The building is excavated from the entire hill. It is not only the wall, but also the roof is excavated in the Jiaohe Gucheng famous both at home and abroad because of its construction method of “reducing the floor into a wall.” Therefore, it is of typical significance to study the building construction method of crossing the old city.