Based on current literatures, the paper was aimed to make improvement of the existing synthesis process of cetirizine hydrochloride.The improved process had less steps with easy operations, thus it had better industrial advantages.By using benzene and p-chlorobenzyl chloride as raw materials, the improved process had only 5 steps (Friedel-Crafts reaction, bromination, addition, condensation and purification) to gain the target compound finally.