程本《红楼梦》写到大观园“从东边一带……至西北”的一条边长是三里半。本文从大观园内建筑景点的具体描绘和《红楼梦》的思想内容需要等方面进行分析,推断出只有程本《红楼梦》中的大观园规模才是正确的,合理的,才是曹雪芹的原著。而脂评本随意缩小大观园的面积,是因为其炮制者没有读懂《红楼梦》。 Cheng Ben “Dream of Red Mansions” wrote Grand View Garden “from the east side to the northwest ” one side length is three and a half. This thesis analyzes the concrete description of architectural attractions in Daguan Garden and the ideological content of “Dream of Red Mansions”, and concludes that only the scale of Grand View Garden in “Dream of the Red Chamber” is correct and reasonable, which is the original of Cao Xueqin. The fat critics free to reduce the area of ​​Grand View Garden, because its processor did not read “Dream of Red Mansions.”