An ink composition for a 3D printing support comprising an amine-containing monomer and a photo-initiator, which ink composition further comprises a water soluble polymer, wherein the water soluble polymer is the compound of the following Formula 8a: wherein n is 50 to 25,000 and which ink composition further comprises a monomer containing at least one of a vinyl group and an acrylate group, and a vinyl ether compound, wherein the vinyl ether compound is selected from 4-hydroxybutyl vinyl ether, ethyl vinyl ether, butyl vinyl ether, cyclohexyl vinyl ether, 2-ethylhexyl vinyl ether, dodecyl vinyl ether, diethylene glycol divinyl ether, 1,4-cyclohexane dimethanol divinyl ether, triethylene glycol divinyl ether and 1,4-butanediol divinyl ether, wherein the amine-containing monomer is the compound of the following Formula 1: wherein R 1 is hydrogen or methyl, and R 2 and R 3 are each independently hydrogen, C 1 to C 10 alkyl, vinyl, alkoxyl, cyclohexyl, phenyl, benzyl, alkylamine, alkyl ester, alkyl ether, the amine-containing monomer is the compound of the following Formula 2: wherein R' 1 and R' 2 are each independently hydrogen, C 1 to C 10 alkyl, vinyl, alkoxyl, cyclohexyl, phenyl, benzyl, alkylamine, alkyl ester or alkyl ether, and R' 3 is hydrogen or methyl, the amine-containing monomer is the compound of the following Formula 3: wherein, R 1 is hydrogen or methyl, 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 amine-containing monomer is the compound of the following 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 C 1 to C 10 alkyl, and R 4 is -CH=CH 2, or the amino-containing monomer is a compound selected from: or the amine-containing monomer is the compound of the following Formula 5, Formula 6 or Formula 7: wherein n is 50 to 25,000 and which ink composition further comprises a monomer containing at least one of a vinyl group and an acrylate group, and a vinyl ether compound, wherein the vinyl ether compound is selected from 4-hydroxybutyl vinyl ether, ethyl vinyl ether, butyl vinyl ether, cyclohexyl vinyl ether, 2-ethylhexyl vinyl ether, dodecyl vinyl ether, diethylene glycol divinyl ether, 1,4-cyclohexane dimethanol divinyl ether, triethylene glycol divinyl ether and 1,4-butanediol divinyl ether, wherein the amine-containing monomer is the compound of the following Formula 1: wherein R 1 is hydrogen or methyl, and R 2 and R 3 are each independently hydrogen, C 1 to C 10 alkyl, vinyl, alkoxyl, cyclohexyl, phenyl, benzyl, alkylamine, alkyl ester, alkyl ether, the amine-containing monomer is the compound of the following Formula 2: wherein R' 1 and R' 2 are each independently hydrogen, C 1 to C 10 alkyl, vinyl, alkoxyl, cyclohexyl, phenyl, benzyl, alkylamine, alkyl ester or alkyl ether, and R' 3 is hydrogen or methyl, the amine-containing monomer is the compound of the following Formula 3: wherein, R 1 is hydrogen or methyl, 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 amine-containing monomer is the compound of the following 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 C 1 to C 10 alkyl, and R 4 is -CH=CH 2, or the amino-containing monomer is a compound selected from: or the amine-containing monomer is the compound of the following Formula 5, Formula 6 or Formula 7: