Semiconductor memory device having spare antifuse array and therefor repair method

PURPOSE: A semiconductor memory device including a spare anti-fuse array and a method for repairing the antifuse are provided to minimize the increase of a chip area by not requiring an additional control circuit for driving the spare antifuse array. CONSTITUTION: Antifuses sharing an operation control circuit which performs a program operation or read operation with a unit of a first direction are arranged in an antifuse array(30). A spare antifuse array(40) shares a spare word line with a unit of a second direction cross the first direction. The spare antifuses sharing the operation control circuit with the unit of the first direction with are arranged in the spare antifuse array. The operation control circuit includes a program block logic(10) and a read block logic(20).