Abstract: In order to fill a gap in the seismological products of the earthquake source parameters catalog of the seismic networks, focal mechanism solutions of the 6 earthquake events with M≥4.0 in the mainland of China from December 1 to December 31, 2021 were obtained using the regional full waveform inversion based on the broadband waveforms from China seismic network. The results show that these events include 3 reverse faulting, 2 strike-slip faulting and 1 unknown earthquakes.