Abstract: In order to test the correctness of barcode，the system uses PC and reader of barcode to detect and compare the data of barcode，and uses man-machine interface which is developed by VB software to display the barcode value and set the appropriate parameters，then records and keeps data. Meanwhile the results are sent to Freescale single chip microcomputer through the serial port，then the signal is transferred to the nRF24L01 wireless module sender through SPI bus. At last，the signal is sent into the single chip microcomputer by the nRF24L01 wireless module through SPI bus，then controls the operation of stepper motor according to the correctness of barcode and output the barcode. The system is easy to operate，can be used for teaching and product quality detection.

Key words: wireless transmission, barcode, error detective system