The invention provides a portable terminal. The portable terminal is characterized in that a control unit of the portable terminal outputs a repair command to an initialization unit when determining that an application program saved in a storage unit has errors after receiving an initialization completeness response, reads the repair data of a correct version from a storage after receiving a repair completeness response, repairs the application program which has the errors by utilizing the repair data of the correct version and outputs the repaired application program to the storage unit; theinitialization unit is respectively connected with the storage, an interface and the control unit, acquires the repair data and the version thereof from the interface according to the received repaircommand and outputs the repair data of the correct version to the storage for saving; and the repair data is data obtained after removing file systems and file formats of upgraded files. The invention also provides a microprocessor and a repair method of the portable terminal. The portable terminal, the microprocessor and the repair method can be used for automatically repairing damaged software,thereby enhancing the convenience of repair.