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Aiming at the complex network and high cost of the traditional wired RFID system, This paper introduces a wireless RFID card reader system based on the MCU KW01 (ARM Cortex-M0+), describes the design of component circuit of KW01 and MF RC531, and a RFID component engineering framework and universal component to achieve more efficient software design, ameliorates and transplants SMAC protocol stack to implement Sub-1GHz wireless communication. Test results prove that the system has low power consumption and stability performance which is useful in practical engineering.