This paper introduces the technology of RS-232 serial bus and the universal serial bus,discusses its anti-jamming,analyzes the reason of serial port producing error code and the USB deadlock phenomenon,proposes a solution of stable communication in data acquisition system under strong interference. Uses the RS-232 sending instruction,the USB sending acquisition data,when the com-munication deadlocks,initializes USB interface by the instruction,ensures the stability of communication under strong interference...