为了减少传统Ag-Agcl检测电极在提取有效SEMG信号中可能遇到的干扰与噪声，设计了一种新型Ag-Agcl检测电极。与传统Ag-Agcl检测电极相比较，该系统是由电极、前置放大电路、滤波电路和陷波电路进行密封并加以屏蔽层保护后所组成的有源SEMG检测电极。该检测电极极大地缩短了电极连线，可以用来提取有效的SEMG信号。试验结果表明，采用该SEMG检测电极可以进一步提高信噪比，减少噪声，提取到有效的表面肌电信号。Abstract: In order to reduce the noise and interference that the traditional Ag - Agcl surface electrode may meet in extracting the effective SEMG signal, this paper reseached and designed a new type of Ag-Agcl detection electrode. Comparing with the traditional Ag-Agcl detection electrode ,this system was the active detection electrode which was cornposed of the electrode, the preamplifier circuit, the filter circuits and the trap circuit together and protected by the shielding loyer. The detection electrode greatly shortened the electrode connection and could be used to extract the effective SEMG signal.The Experimental result shows that the SEMG detection electrode can further improve SNR, reduce the noise and get effective surface electromyographic signal.