1. in the food industry, mannitol stearic acid fat for peanut pulp, can prevent oil separation, used for cookies can make cookies crunchy, is not easy to damp, used for candy can rise to finalize the design function, improve the quality of candy. 2. as dehydration labels&tags diuresis medicine, mannitol can reduce intracranial pressure and pressure inside the eye, eliminate brain edema, diuresis and prevent early acute renal insufficiency, preparations for mannitol injection. 3. in daily chemical industry, mannitol in xuehuagao as emulsifier, can make the xuehuagao is exquisite. 4. in engineering, insulation, sound insulation is the important material.