An extract of mulberry twigs is dislcosed, which can be used to prepare the food or the medicine to cure hyperuricemia and gout diseases. The said extract is prepared from mulberry twigs through extracting in solvent (aqueous solution of alcohol, chloroform, acetone, etc) at 10-100 deg.C more than one time, mergint the liquid extracts, recovering solvent, regulating pH value to 7.5-9.5, centrifugal separation to obtain supernatant, regulating pH value to 4-6, deposition, water washing wand drying. Several other approaches for purifying it are also disclosed.