Patching method and system for smart card

The invention discloses a method for patching software of a smart card. The method comprises the steps that a patch code calling interface is reserved in platform system software, patch code operation space is reserved in rewritable storage space, a patch code is downloaded into the reserved rewritable storage space, an entry address of patch code operation is returned to the patch code calling interface, and if the platform system software detects that the patch code calling interface comprises the entry address of the patch code operation, the patch code is operated through the patch code calling interface. The method can achieve the adaptability revision of the platform software of the smart card conveniently, fast and efficiently. The method for patching the software of the smart card can achieve the adaptability revision of the application software of the smart card conveniently, fast and efficiently.