The thermoplastic a crylonitrile-butadiene-styrene(ABS) resin composition with low coefficient of linear thermal expansion according to the present invention comprises (A) (a1) 10 to 100 parts by weight of a rubber- modified grafted copolymer; and (a2) 100 parts by weight of a rubber phase grafted copolymer prepared by 0 to 90 parts by weight of copolymer prepared by a vinyl cyanide compound and an aromatic vinyl compound; (B) 1 to 30 parts by weight of vinyl copolymer containing m aleic anhydride; and (C) 1 to 20 parts by weight of a clay mineral organized with a compound containing functional groups; wherein said compound containing functional groups is selected one or more from the compounds having an onium ion that can proceed an ion exchange reaction with said clay mineral, and having a radical- polymerizable group.