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Search for extraterrestrial intelligence (SETI) has been mainly focused onnearby stars and their planets in recent years. Barnard's star is the secondclosest star system to the sun and the closest star in the FAST observable skywhich makes the minimum Equivalent Isotropic Radiated Power (EIRP) required fora hypothetical radio transmitter from Barnard's star to be detected by FASTtelescope a mere 4.36x10^8 W. In this paper, we present the Five-hundred-meterAperture Spherical radio Telescope (FAST) telescope as the most sensitiveinstrument for radio SETI observations toward nearby star systems and conduct aseries of observations to Barnard's star (GJ 699). By applying the multi-beamcoincidence matching (MBCM) strategy on the FAST telescope, we search fornarrow-band signals (~Hz) in the frequency range of 1.05-1.45 GHz, and twoorthogonal linear polarization directions are recorded. Despite finding noevidence of radio technosignatures in our series of observations, we havedeveloped predictions regarding the hypothetical extraterrestrial intelligence(ETI) signal originating from Barnard's star. These predictions are based onthe star's physical properties and our observation strategy.

The most sensitive SETI observations toward Barnard's star with FAST