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The current envelope detection alogorithm is complex and not suitable for bearing monitoring devices. A design scheme about portable bearing condition monitoring device based on FPGA is proposed. FPGA is the main controller of this instrument. It uses the analog signal amplifier circuit, filter circuit and envelope detection circuit to extract and detect the envelope signal. And it uses the IP core of FPGA to calculate the spectral information through DFT operation. Finally the results display on the LCD which is useful bearing condition monitoring and diagnosis. The instrument is based on the embedded FPGA architecture and uses the hardware circuit to implement the envelope detection function with a high speed, portability, low power, high performance advantages.