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We report the detailed physical properties of quateary compound Ba2BiFeS5 with the key structural ingredient of isolated FeS4 tetrahedra.Magnetization and heat capacity measurements clearly indicate that Ba2BiFeS5 has a paramagnetic to antiferromagnetic transition at about 30 K.The calculated magnetic entropy above ordering temperature is much smaller than theoretical value for high-spin Fe3+ ion with S =5/2,implying the possible short-range antiferromagnetic fluctuation in Ba2BiFeS5.