The title compound C15H12N4O2S was synthesized by the reaction of 3-(2-hydroxy- benzyl)-4-amino-(1H)-1,2,4-triazole-5-thione with 4-hydroxybenzaldehyde in ethanol and charac- terized by IR, H NMR spectra and elemental analysis. Its structure has been determined by X-ray 1 diffraction analysis. The crystal belongs to monoclinic, space group C2/c with a = 27.990(3), b = 13.1326(14), c = 7.9770(8) ?, β = 105.787(2)°, V = 2821.6(5) ?3, Z = 8, Mr = 312.35, μ = 0.243 mm–1, Dc = 1.471 g/cm3 and F(000) = 1296. The structure was solved by direct methods and refined to a Rint value of 0.0388. The crystal structure involving in intermolecular N–H???S and O–H???S hydrogen bonds is observed, meanwhile intramolecular O–H???N hydrogen bond is also found. Their biological activities have been measured. The results show that this type of compound has certain antibacterial activity for Staphylococous aureus and Bacillus subtilis. The title compound C15H12N4O2S was synthesized by the reaction of 3- (2-hydroxy-benzyl) -4-amino- (1H) -1,2,4-triazole- 5-thione with 4-hydroxybenzaldehyde in ethanol and charac- terized by IR, H NMR spectra and elemental analysis. Its structure has been determined by X-ray 1 diffraction analysis. The crystal belongs to monoclinic, space group C2 / c with a = 27.990 (3), b = 13.1326 (14), c = 7.9770 (8)?,? = 105.787 (2) °, V = 2821.6 (5)? ​​3, Z = 8, Mr = 312.35, μ = 0.243 mm-1, Dc = 1.471 g / cm3 and F 1296. The structure was solved by direct methods and refined to a Rint value of 0.0388. The crystal structure involving in intermolecular N-H ??? S and O-H ??? S hydrogen bonds is observed, meanwhile intramolecular O-H? Their biological activities have been measured. The results show that this type of compound has certain antibacterial activity for Staphylococous aureus and Bacillus subtilis.