A new series of 1,2,4,8-tetraazaspiro[4.5]dec-2-enes containing 1,2,4-triazole, piperidine and sulfonamide moieties have been synthesized from the reaction of 4-piperidone benzoylhydrazones having 1-methyl, 1-benzyl, and 1isopropyl groups with appropriate nitrilimines. The microanalysis and spectral data (IR, 1 H NMR, 13 C NMR and MS) of the synthesized compounds are in full agreement with their molecular structure. The microbial features of the synthesized compounds were studied by a known method. Some of titled compounds exhibited significant antimicrobial activity on several strains of microbes.