A catalyst composition, comprising: a transition metal compound represented by the following Formula 1; and one or more of a compound represented by the following Formula 2, a compound represented by the following Formula 3 and a compound represented by the following Formula 4: [Formula 2] -[Al(R 10)-O] a - [Formula 3] A(R 11) 3 [Formula 4] [L-H] + [WD 4] - or + [WD 4] - in Formula 1, R 1 to R 9 are each independently selected from the group consisting of hydrogen, a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, a cycloalkyl having 3 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, an alkylaryl having 7 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms, an aryloxy having 6 to 20 carbon atoms, a silyl, and a combination thereof, or two or more adjacent functional groups of R 1 to R 9 are connected to each other to form an aliphatic ring having 3 to 20 carbon atoms or an aromatic ring having 3 to 20 carbon atoms; X 1 and X 2 are each independently selected from the group consisting of a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, a cycloalkyl having 3 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an alkylaryl having 7 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, an alkylamino having 1 to 20 carbon atoms, an arylamino having 6 to 20 carbon atoms, and an alkylidene having 1 to 20 carbon atoms; where the cycloalkyl and aryl may each be independently substituted with 1 to 5 substituents selected from the group consisting of a halogen, -CF 3, -NO 2, -OH, -SH, -CN, an alkoxy having 1 to 6 carbon atoms, an alkyl having 1 to 8 carbon atoms, an alkenyl having 2 to 8 carbon atoms, and an alkynyl having 2 to 8 carbon atoms; M is a Group 4 metal; Y is a Group 16 element; n is an integer of 0 to 20; in Formulas 2 to 4, R 10 and R 11 may be the same or different and are each independently selected from the group consisting of a halogen, a hydrocarbyl having 1 to 20 carbon atoms, and a hydrocarbyl having 1 to 20 carbon atoms substituted with a halogen; A is aluminum or boron; D independently represents an aryl having 6 to 20 carbon atoms or an alkyl having 1 to 20 carbon atoms in which at least one hydrogen atom may be substituted with a substituent, and the substituent is at least one selected from the group consisting of a halogen, a hydrocarbyl having 1 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms and an aryloxy having 6 to 20 carbon atoms; H is a hydrogen atom; L is a neutral or cationic Lewis acid; W is a Group 13 element; and a is an integer of 2 or more. a transition metal compound represented by the following Formula 1; and one or more of a compound represented by the following Formula 2, a compound represented by the following Formula 3 and a compound represented by the following Formula 4: R 1 to R 9 are each independently selected from the group consisting of hydrogen, a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, a cycloalkyl having 3 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, an alkylaryl having 7 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms, an aryloxy having 6 to 20 carbon atoms, a silyl, and a combination thereof, or two or more adjacent functional groups of R 1 to R 9 are connected to each other to form an aliphatic ring having 3 to 20 carbon atoms or an aromatic ring having 3 to 20 carbon atoms; X 1 and X 2 are each independently selected from the group consisting of a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, a cycloalkyl having 3 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an alkylaryl having 7 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, an alkylamino having 1 to 20 carbon atoms, an arylamino having 6 to 20 carbon atoms, and an alkylidene having 1 to 20 carbon atoms; where the cycloalkyl and aryl may each be independently substituted with 1 to 5 substituents selected from the group consisting of a halogen, -CF 3, -NO 2, -OH, -SH, -CN, an alkoxy having 1 to 6 carbon atoms, an alkyl having 1 to 8 carbon atoms, an alkenyl having 2 to 8 carbon atoms, and an alkynyl having 2 to 8 carbon atoms; M is a Group 4 metal; Y is a Group 16 element; n is an integer of 0 to 20; in Formulas 2 to 4, R 10 and R 11 may be the same or different and are each independently selected from the group consisting of a halogen, a hydrocarbyl having 1 to 20 carbon atoms, and a hydrocarbyl having 1 to 20 carbon atoms substituted with a halogen; A is aluminum or boron; D independently represents an aryl having 6 to 20 carbon atoms or an alkyl having 1 to 20 carbon atoms in which at least one hydrogen atom may be substituted with a substituent, and the substituent is at least one selected from the group consisting of a halogen, a hydrocarbyl having 1 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms and an aryloxy having 6 to 20 carbon atoms; H is a hydrogen atom; L is a neutral or cationic Lewis acid; W is a Group 13 element; and a is an integer of 2 or more.