PURPOSE: Provided is a process for producing beverage by using Imperata cylindrica var. koenigii as a main ingredient, therefore the beverage inhibits thrombosis, stops bleeding, promotes urination, perspires and has a therapeutic effect on jaundice. CONSTITUTION: The process for producing beverage by using Imperata cylindrica var. koenigii comprises the steps of: crushing Imperata cylindrica var. koenigii; adding 0.05% NaCl solution into 1 kg of the crushed Imperata cylindrica var. koenigii and extracting it for 4 hours; adding 0.6 kg of glucose and 1.2 kg of ructooligosaccharide into 15 liter of the extract to make the sugar degree 10 Brix; adding 0.53 kg of citric acid into the extract, and inserting and sealing it into a vessel; and autoclaving the extract at 121 deg.C for 15 minutes and cooling it in cold water of 20 deg.C. for 15 minutes.
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