Houdoumen is a kind of terrain, which has nothing to do with farming. Located in the southeast of Wujiang District, Suzhou City, Jiangsu Province, ultra-thin carbon layer area. The ground is uneven and there is a lot of farmland. Because of the low terrain and perennial water accumulation, the land is barren, dry and airtight, which is extremely unfavorable to crop growth. So it is not suitable for planting. Doumen is called "plowing, boy" because of a story circulating in China.