Illicium verum is a common seasoning, which is necessary for cooking fish stew and making braised dishes. They are called "fennel" because they can remove the smell of meat and add flavor again. Star anise is aniseed, and its scientific name is "Star anise". Fennel seeds are condiments, and their stems and leaves are also fragrant, and they are often used as fillings for steamed stuffed buns, jiaozi and other foods. The main ingredient they contain is fennel oil, which can stimulate gastrointestinal nerves and blood vessels, promote the secretion of digestive juice, increase gastrointestinal peristalsis and eliminate gas accumulation, so it has the effect of invigorating stomach and promoting qi circulation; Sometimes gastrointestinal peristalsis will decrease after excitement, which will help relieve spasm and pain. According to China Pharmacopoeia, fennel preparation is often used for invigorating stomach, dispelling cold, promoting qi circulation and relieving pain. Aniline can promote the maturation of bone marrow cells and release them into peripheral blood, and has obvious effect of increasing white blood cells, mainly neutrophils, which can be used for leukopenia.