Tongcao is very effective in lowering milk. The main treatment of Tongcao is the weakness of the spleen and stomach, which leads to poor milk supply to meet the needs of the baby, and this condition is best treated with Tongcao. It can be simmered with ingredients such as carp, pork knuckles and seafood. It can also be used to make porridge, which can nourish the patient’s spleen and stomach, so that the patient can produce more milk to nourish the baby. Many patients with poor lactation caused by liver stagnation, unable to produce milk, can be treated with Tong Cao with Chai Hu and other related herbs, which can resolve the patient’s qi stagnation and clear the liver meridian, which will also cause the patient to breastfeed normally. The clinical application of Tongcao is best done under the guidance of a doctor.