Using calculated focal mechanism solutions of M_L≥2.0 earthquakes from 2003 to 2021 in Wuzhong-Lingwu area,the stress tensor variances in Wuzhong-Lingwu area were inverted using superposition stress field inversion method,and its spatial and temporal distribution characteristics were also studied. The relationship between four M_S≥4.0 earthquakes in Wuzhong-Lingwu region and focal mechanism consistency parameters in the region was analyzed,and then the prediction index of focal mechanism consistency parameters in the region was extracted,and its prediction efficiency was discussed. The results show that the spatial range of stress tensor variance in Wuzhong-Lingwu region from 2003 to 2021 is mainly between 0.13 and 0.22,with the latitude of 38.1ås the dividing line,showing the zoning characteristics of low in the south and high in the north. The four M_S≥4.0 earthquakes generally occurred in the transition region between high and low values of the stress tensor variance. There are two significant “abnormal” changes in the temporal sequence diagram of the stress tensor variance,which is characterized by the temporal sequence stress tensor variance being lower than 0.1 for about one year and showing a significant “V-shaped” change. These two “V-shaped” changes correspond to the 2012 Yongning M_S4.6 earthquake and 2021 Lingwu M_S4.0 earthquake respectively. Before the earthquake happens,the temporal stress tensor variances all have experienced a change of descending,turning,rising and earthquake occurring,and the time interval between rising and an earthquake occurrence is about one year. By analyzing prediction efficiency in the area,it is shown that the consistency parameters of focal mechanism can be used as the medium and long term prediction index of M_S≥4.0 earthquakes in Wuzhong-Lingwu region.