Disclosed herein are a hydrolysate of water extract ofSyzygium samarangenseand the preparation process thereof. Also disclosed is that the hydrolysate of water extract ofSyzygium samarangensecan be used in promoting skin whitening, enhancing the moisture-retaining capacity of the skin, promoting wound healing, and anti-oxidation.本發明揭示一種蓮霧水萃取物的水解產物暨其製備方法。本發明亦揭示該蓮霧水萃取物的水解產物可被用於促進皮膚美白、提升皮膚的保濕能力、促進傷口癒合以及抗氧化。