Cassia seed is a kind of traditional Chinese medicine, which belongs to the dried mature seeds of cassia seed or cassia obtusifolia, a leguminous plant, and is famous for improving eyesight. Cassia seed tastes bitter, sweet and salty, slightly cold, and enters the liver, kidney and large intestine; Moisten intestine to relieve constipation, reduce blood fat and improve eyesight, and treat constipation, hyperlipidemia and hypertension. Clearing liver, improving eyesight, promoting diuresis, relaxing bowels, stopping diarrhea, lowering blood pressure and blood lipid. The seed of Platycladus orientalis leaves is also a kind of traditional Chinese medicine, which belongs to the dried and mature seed kernel of Platycladus orientalis leaves. Has the effects of nourishing the heart, calming the nerves, relaxing bowels, and stopping sweating. Can be used for treating yin deficiency and blood deficiency, asthenia, insomnia, palpitation, constipation due to intestinal dryness, and night sweats due to yin deficiency. They are not absolutely incompatible, but have a certain synergistic effect, so they can soak in water together.