In food, the drink industry serves as the flavor medicinal preparation, the stabilizer; Serves as the anti-blood in the pharmaceutical industry to congeal the medicinal preparation, the expectorant and the diuretics; In the detergent industry, may substitute the sodium tripolyphosphate to take the non-toxic detergent the assistant; Also uses in brewing, the inoculation fluid, the photographic drugs and the galvanization and so on. in the lemon juice includes the massive citric acid, the citric acid and the calcium ion union becomes the soluble complex compound, can alleviate the calcium ion to urge the blood coagulation the function, may prevent and treat hypertension and the cardiac arrest. Therefore may play the anti-thrombosis.