Abstract: A new process of synthesizing n-octyl gallate was studied by using non-oxidative acid to replace concentrated sulfuric acid as catalyst without addition of water-carrying agent. The effects of different preparation parameters were studied with orthogonal test. The results show that optimum conditions of synthesizing octyl gallate were obtained as following:ratio of acid to alcohol 1:6, catalyst dose 12%, reaction temperature 120℃, reaction time 4h, average yield of product 92.3%.