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We design and construct a resonant photodetector(RPD)with a Q factor of 320.83 at the resonant frequency of 38.5 MHz on the basis of a theoretical analysis.Compared with the existing RPD under the same conditions,the signal-to-noise-ratio of the error signal is increased by 15 dB and the minimum operation power is reduced from-55 dBm to-70 dBm.By comparing the standard deviations of the stability curves,we confirm that the RPD has a dramatic improve-ment on ultralow power extraction.In virtue of the RPD,we have completed the demonstration of channel multiplexing quantum communication.