2009年07月09日在云南省姚安县发生了Ms6.0地震，本文利用云南区域数字地震台网记录的M_L≥2.0余震波形记录，通过对S波观测记录谱进行传播路径、场地响应和仪器响应等影响的逐一消除，得到了131个M_L≥2.0地震的震源谱，进而根据Brune圆盘震源模型，利用遗传算法计算了地震矩、应力降、震源半径等震源参数，结果表明，该地震序列的Mo 在10¹²～10¹⁶N.m间，与近震震级有很好的线性关系，与震源半径呈线性关系；应力降与近震震级有一定的线性趋势相关性；拐角频率和地震矩M_o之间有明显的依赖关系。

 Yao’an M_s6.0 earthquake On July 09，2009 occurred in Yunnan. Using waveforms of the M_L≥2.0 earthquakes recorded by Yunnan Regional Digital Network ,By removing propagation，site and instrument effects from the displacement spectra of the S_wave recordings,we obtain the source parameters of 131 M_L≥2.0 earthquakes based on the Brune disc model and Genetic algorithm, namely, the seismic moment Mo, stress drop Δσ and rupture radius  r ,The results show that there is a good linear relation between Mo(10¹²～10¹⁶N.m) and local magnitude M_L ; Mo and rupture radius r . Δσ seems dependent on M_L; f_c increases with M₀ decreasing according to the lg fc_ M_o relation.