2, fennel ketone and anisaldehyde, etc., whose aroma mainly comes from aromatic substances such as fennel ketone and anisaldehyde. Fennel can stimulate gastrointestinal nerve and blood vessels, promote the secretion of saliva and gastric juice, and play a role in stimulating appetite and helping digestion; Foeniculum vulgare also has the functions of promoting intestinal peristalsis, relieving spasm, reducing pain and resisting bacteria.