In China, the efficacy of barley tea has long been recorded in ancient books. In Li Shizhen's Compendium of Materia Medica, the evaluation of barley tea is "sweet in taste, flat in nature, capable of resolving food stagnation, calming stomach and quenching thirst, relieving summer heat, benefiting color, strengthening five internal organs and melting grains." Professor Li Peiwen, director of the Department of Traditional Chinese Medicine Oncology of China-Japan Friendship Hospital of the Ministry of Health, introduced that barley belongs to Gramineae and is one of the ancient grain varieties in China. According to the nature of Chinese medicine, barley is cool, sweet and salty; Entering the spleen and stomach meridian has the functions of invigorating the spleen and promoting digestion, clearing away heat and quenching thirst, and inducing diuresis, and has a certain laxative effect. Especially barley malt, contains amylase, which can increase gastric acid and pepsin and help digestion. Zhang also said: "Barley tea can warm and warm the stomach, and can remove fire, but its nature is milder than green tea, and people with bad stomachs can drink it."

Finally, from the composition point of view, barley tea does not contain theophylline, caffeine, tannin and other irritating substances, which neither affects sleep nor excites people. Barley tea is undoubtedly the best drink for many people who are neurasthenia and usually like drinking tea but have insomnia. It can not only enjoy the sweetness of tea, but also be beneficial to their health, even before going to bed.