There are many types of constipation, and heat knot constipation is the most common, i.e., constipation caused by fire and damp-heat. For constipation caused by damp-heat syndrome, the medicines for lowering the fire, including Niu Huang Xie Du Pian and Niu Huang Shang Qing Pian, are set for heat constipation. For dry stools, TCM believes that no boat can move without water, so for heat constipation, heat needs to be limited and water needs to be nourished. It can be taken to increase the liquid Cheng Qi Tang, increase the liquid Cheng Qi Yuan Di Dong, there are Yuan Shen, Maidong, raw land, known as the increase of liquid Tang; Hovenia Hedyssey, thick Park and rhubarb Tang, Hovenia Hedyssey, thick Park, rhubarb, known as Xiao Cheng Qi Tang. ZengYiTang combined to XiaoChengQiTang is ZengYiChengQiTang, which is very effective for heat constipation, more ideal than NiuHuangXieDianYuPan and NiuHuangShangQingPan. Therefore, it should not only clear heat, but also convey water. With water in the intestines, Citrus aurantium can break the knot, and rhubarb can pass the stool. It is more effective than purely laxative fire medicine, so doctors mostly use Enriching Liquid Cheng Qi Tang for damp-heat constipation.