In order to achieve the best filtering effect, on the basis of researching of adaptive filter architecture and algorithm, building the hardware platform of verify signal processing algorithm using DSP, A/D and D/A technology, and through DSP software programming done Engineering realization of adaptive filtering algorithm, then filter effect of LMS adaptive filter algorithm is verified and analyzed. Tests show that performance of adaptive filter descends with the descending of the SNR, and when the SNR is 0dB, LMS adaptive filtering algorithm cannot realize filtering function.