A radio frequency identification (RFID) system and a method for correcting a failed cell using the same are provided. The RFID system effectively corrects randomly distributed cell data by using a failed cell correcting circuit in a memory. In the RFID system, a predetermined number of unit cells are separated into one memory group, and the same data are stored in each memory group at a write mode. At a read mode, the cell data of the selected memory group are compared, and the same data are identified as effective data to improve yield of the RFID system.