Lemon is a perennial evergreen plant species, and belongs to Citrus of Rutaceae. With ellipse fruits in green or orange, lemon peel is thick and nutritious, rich in vitamins of E, P, B1, B2, and C, organic acid, limonene, bioflavonoid, lemon polyphenol and limonin, in addition, it contains microelements of Mg, K, Na and P necessary for human bodies. Its nutritious elements are helpful for human bodies strengthening organism immunity with softening blood vessels, anti-arteriosclerosis, anticoagulation, anti-toxicants, detoxification, maintaining blood health, antitumor effects and cancer prevention.