In this paper,the methods of aspect ratio and polarization analysis were used to determine the S-wave splitting parameters of 10 stations in Yibin,Sichuan from April 25,2013 to December 31,2015,i.e.,fast wave polarization direction and slow wave delay time. The results show the polarization directions of fast shear waves on both sides are different. In the west of Huaying Fault the dominant polarization directions of fast shear waves are NW in agreement with the directions of the regional principal compressive stress. In the east the dominant polarization directions of fast shear waves are NE,which is consistent with the strike of Huaying Fault. The dominant polarization directions of fast shear waves at the station CNI in the earthquake concentrated area are NE,which is almost consistent with the strike of faults near the stations. The dominant polarization directions of fast shear waves at the 3 stations(JLI,YAJ,and XWE)in the southern section of the study area are near NS. The average delay time of slow shear waves at each station is in the range of 3.31-11.95ms/km,the maximum delay time of slow shear wave is at the station CNI which is the nearest station from the epicenter of M_L5.2 earthquake,reflecting the strong anisotropy in the source area. The delay times of slow shear waves at the station CNI are in disorder in the period after the two M_S4.0 earthquakes. Characteristic increases of time-delays is observed before the M_L4.8 earthquake on February 7,2015.