We firstly used matched filter technique to detect missing earthquakes in the Wuwei M_S3.0 earthquake swarm sequence,and 5 missing earthquakes during M_L0.5-1.2 were detected,which led to a more complete catalogue. Then waveform cross-correlation phase detection technique was used to recalibrate P- and S-wave phase arrival times,and further relocate the earthquakes in the swarm using the double-difference method based on recalibrated phase arrival times,which shows the relocated epicenters were distributed in more concentrated locations and without obvious predominant directions. The focal mechanisms of stronger earthquakes of the swarm were calculated by using the Snoke methods,indicating this earthquake swarm sequence was caused by strike-slip faulting with thrust component under the action of horizontally compressed nearly in NEE direction and horizontally dilated nearly in NNE direction. The Yanjiaqiao-Fengshahu fault is likely to be seismogenic structure of the Wuwei M_S3.0 earthquake swarm sequence. Apparent stress of the Wuwei M_S3.0 earthquake swarm sequence was calculated,which shows that apparent stress and variation of the apparent stress eliminated the effect of the magnitude recovered gradually with the attenuation of the earthquake swarm sequences,so we refer that larger earthquake may be unlikely to occur around the Wuwei epicenter.