Coptis chinensis has the functions of clearing away heat and purging fire, detoxifying and dehumidifying, while Cinnamomum cassia has the functions of promoting blood circulation, relieving pain, dredging menstruation and strengthening yang. These two traditional Chinese medicines are often used to treat heart-kidney disharmony, with upper heat and lower cold. Generally speaking, the ratio of Rhizoma Coptidis to Cortex Cinnamomi is 6: 1, which can ensure the best therapeutic effect. Of course, the specific proportion may vary according to the severity of patients' symptoms and needs to be adjusted according to the guidance of doctors.