The M4.9 Yingcheng earthquake on December 26,2019 in Hubei Province were felt by residents in most areas of Wuhan. In order to analyze the seismogenic structure and aftershock activity of this earthquake,the focal mechanisms and centroid depth of the earthquake are determined by waveform modelling with different velocity models. The inversion results are evaluated by bootstrapping sampling inversion technique. We use waveforms of the main shock and aftershocks to obtain a more complete aftershock catalog by template matching technique. The results show that the Yingcheng earthquake is dominant with strike slip movement,and the centroid depth is about 7.5km with the moment magnitude of M_W4.67. There are one foreshock and 17 aftershocks detected,but the aftershock sequence is in lack of M 2~4 events,which indicates that the Yingcheng earthquake is an isolated earthquake. The b-value of the earthquake sequence below M 2 is 0.8.