NOVELTY - Synthesizing epinastine comprises sequentially adding water, sodium hydroxide and 6-aminomethyl-6,11-dihydro-5H-dibenz(b,e)azepine fumarate into a reaction container, then adding dichloromethane, reacting, separating organic layer and drying to obtain 6-aminomethyl-6,11-dihydro-dibenzo-azepine in dichloromethane, adding nitrile bromide of dichloromethane into a reaction flask, cooling, adding 6-aminomethyl-6,11-dihydro-dibenzo-azepine in dichloromethane, reacting, drop-wisely adding N-methylbenzylamine, refluxing, adding e.g. toluene, reacting, separating crystals, filtering and washing.    USE - The method is useful for synthesizing epinastine (claimed).    ADVANTAGE - The method is simple, economical, consumes less energy and produces high yield product.    DETAILED DESCRIPTION - Synthesizing epinastine comprises: (i) sequentially adding water, sodium hydroxide and 6-aminomethyl-6,11-dihydro-5H-dibenz(b,e)azepine fumarate into a reaction container, then adding dichloromethane and reacting at 22-23 degrees C for 8 hours by stirring, allowing the reaction mixture to stand for separation, separating organic layer and drying to obtain 6-aminomethyl-6,11-dihydro-dibenzo-azepine in dichloromethane; (ii) adding nitrile bromide of dichloromethane into a reaction flask, cooling to less than -5 degrees C, maintaining internal temperature to -8 to -7 degrees C, drop-wisely adding 6-aminomethyl-6,11-dihydro-dibenzo-azepine in dichloromethane into the flask, reacting for 8 hours, maintaining internal temperature to 25 degrees C, drop-wisely adding N-methylbenzylamine, refluxing at 38-42 degrees C for 45 minutes under atmospheric pressure, then adding toluene, water and sodium hydroxide into the system, reacting at 60-70 degrees C for 1.5 hours by stirring, cooling to 3-4 degrees C, separating out crystals, filtering and washing to obtain wet product; and (iii) dissolving the wet product in chloroform, separating the organic layer, washing with chloroform, mixing the organic layers, concentrating under reduced pressure at 70 degrees C, adding toluene into the residue, evaporating into dryness at 70 degrees C, adding toluene, heating at 63-67 degrees C for 1.5 hours, aging, cooling to crystallize at 3.5 degrees C, filtering to obtain wet product, washing with n-heptane and vacuum-drying.