A gelling system based on the polymerization of epoxy resin ethylene glycol diglycidyl ether (EGDGE) and 3,3-Diaminodipropylamine (DPTA) was developed for gelcasting alumina ceramics. The gelation process of 50vol% alumina-epoxy resin suspensions were investigated in accordance with the change in temperature and epoxy resin concentration. The activation energy Ea of polymerization reaction was 63.76kJ/mol and no significant gelation was observed at 25 degrees C during the test for 50vol% Al2O3 suspensions with 10wt% EGDGE. With the increase in EGDGE concentration, Al2O3 green bodies exhibited higher relative density, flexural strength, and Weibull modulus, reaching 64.4%, 41.03MPa, and 12.51, respectively, when EGDGE concentration was 20wt%. However, for sintered Al2O3 bodies, the highest characteristic strength and Weibull modulus were obtained for 15wt% EGDGE concentration, reaching 367.57MPa and 14.52, respectively.