A method for forming a three-dimensional object comprising the steps of: a) forming a three-dimensional object comprising a structure body and a support by laminating a plurality of layers; and b) removing the support by dissolving the support in a mixture solution of water and a polar organic solvent, wherein the support is manufactured through a step of curing an ink composition for a three-dimensional printing support comprising an amine-containing monomer and a curing agent, wherein the amine-containing monomer is the compound of the following Chemical Formula 1: wherein, R 1 is hydrogen or a methyl group, and R 2 and R 3 are each independently hydrogen, a C 1 -C 10 alkyl group, a vinyl group, an alkoxyl group, a cyclohexyl group, a phenyl group, a benzyl group, an alkylamine group, an alkyl ester group, or an alkyl ether group; the compound of the following Chemical Formula 2: wherein, R' 1 and R' 2 are each independently hydrogen, a C 1 to C 10 alkyl group, a vinyl group, an alkoxyl group, a cyclohexyl group, a phenyl group, a benzyl group, an alkylamine group, an alkyl ester group or an alkyl ether group, and R' 3 is hydrogen or a methyl group; the compound of the following Chemical Formula 3: wherein, R 1 is hydrogen or a methyl group, R 2 is CH 2, CH 2 CH 2, CH 2 CH 2 CH 2, CH(CH 2)CH 2, CH 2 CH 2 CH 2 CH 2, CH 2 C(CH 3) 2 or C(CH 3) 2 CH 2 CH 2, and R 3 and R 4 are each independently hydrogen, methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, -CH=CH 2, or -CH 2 -CH=CH 2; the compound of the following Chemical Formula 4; wherein, n is an integer of 1 to 4, A is C, O, N or S, R 1, R 2 and R 3 are each independently hydrogen or a C 1 -C 10 alkyl group, and R 4 is -CH=CH 2, the compound of the following Chemical Formula 5; Chemical Formula 6; or Chemical Formula 7: a) forming a three-dimensional object comprising a structure body and a support by laminating a plurality of layers; and b) removing the support by dissolving the support in a mixture solution of water and a polar organic solvent, wherein the support is manufactured through a step of curing an ink composition for a three-dimensional printing support comprising an amine-containing monomer and a curing agent, wherein the amine-containing monomer is the compound of the following Chemical Formula 1: wherein, R 1 is hydrogen or a methyl group, and R 2 and R 3 are each independently hydrogen, a C 1 -C 10 alkyl group, a vinyl group, an alkoxyl group, a cyclohexyl group, a phenyl group, a benzyl group, an alkylamine group, an alkyl ester group, or an alkyl ether group; the compound of the following Chemical Formula 2: wherein, R' 1 and R' 2 are each independently hydrogen, a C 1 to C 10 alkyl group, a vinyl group, an alkoxyl group, a cyclohexyl group, a phenyl group, a benzyl group, an alkylamine group, an alkyl ester group or an alkyl ether group, and R' 3 is hydrogen or a methyl group; the compound of the following Chemical Formula 3: wherein, R 1 is hydrogen or a methyl group, R 2 is CH 2, CH 2 CH 2, CH 2 CH 2 CH 2, CH(CH 2)CH 2, CH 2 CH 2 CH 2 CH 2, CH 2 C(CH 3) 2 or C(CH 3) 2 CH 2 CH 2, and R 3 and R 4 are each independently hydrogen, methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, -CH=CH 2, or -CH 2 -CH=CH 2; the compound of the following Chemical Formula 4; wherein, n is an integer of 1 to 4, A is C, O, N or S, R 1, R 2 and R 3 are each independently hydrogen or a C 1 -C 10 alkyl group, and R 4 is -CH=CH 2, the compound of the following Chemical Formula 5; Chemical Formula 6; or Chemical Formula 7: