对山西地区4次M_s≥4.0地震震中距20—80km的近台PG、SG波列进行频谱分析,结果显示，不同震相的频谱特征存在较大差异，优势频段不一。并对山西大同M_s4.6、阳曲M_s4.6地震波列进行小波多分辨分解，结果显示，PG、SG波均表现为多组波列，且差异较大，可能与两次地震的破裂机制、所处构造部位不同有关。

 This article Frequency spectrum analysis based on the Shanxi area 4 M_s≥ 4.0 earthquakes in epicentral distance 20-80km near PG, SG wave, results show that the spectral characteristics of the different phases are quite different, the dominant band is not same. Also on the Shanxi DatongM_s 4.6, YangquM_s 4.6 earthquake wave based on wavelet multiresolution decomposition, the results showed that PG, SG wave showed multiple wave, and the difference is large, it may be relate to rupture mechanism and the located in different structure parts on two earthquakes.