Siheyuan, also known as Sihefang, is a traditional courtyard building in China. Its pattern is that a courtyard is surrounded by houses on all sides, and the courtyard is enclosed in the middle from all sides, so it is called Siheyuan.四合院，又称四合房，是中国的一种传统合院式建筑，其格局为一个院子四面建有房屋，从四面将庭院合围在中间，故名四合院。