Surface electromyography（ s EMG） signal is noise-sensitive biological signal

particularly susceptible to power frequency

baseline drift

white noise. Based on analysis on features of noise interference and combined with feature of s EMG signal

use spectrum interpolation method to eliminate working frequency interference in frequency domain. And utilize opening and closing operation of morphological filtering to acquire characteristics of baseline drift

so as to remove baseline drift from the signal. Based on analysis on intrinsic mode functions obtained by empirical mode decomposition（ EMD）

white noise can be eliminated. Experimental results show that the above filtering method can achieve satisfied filtering effect without damaging useful signal.