Today, determining the focal mechanism of earthquakes as one of the most important parameters related to seismic sources is of great importance in seismlogical studies. The purpose of this study is to analyze the focal mechanism of the 28th November 2021 earthquake, which occurred 58 km southwest of the city of Qaen in the province of Southern Khorasan with a magnitude of 5 on a local scale. The calculation of the focal mechanism of this earthquake is based on three methods: 1) Polarization (polarity) of the first P-wave arrival, 2) Combination of polarization of the first P-wave arrival and the ratio of P to S amplitudes, and 3) Waveform modeling to solve the seismic moment tensor. In addition, the historical and instrumental seismicity situation is examined with emphasis on introducing the main trends and mechanisms of the faults. In the present study, the predominant focal mechanism of this earthquake has been calculated as a right-lateral strike-slip type, which is consistent with the predominant mechanism of faults in the region.