The title of the molecule 6-methyl-7, 9-diphenyl-1, 4, 8-triazaspiro (4.5) decane is synthesized__ampersandsignnbsp; from the condensation reaction of ethylenediamine with (t)3-methyl-r(2),c(6)-diphenyl Piperidin- 4-one. The product is evidenced by IR, 1H NMR and 13C NMR spectra. In the 1H NMR study, it is found that the ABX spin system belongs to this molecule.The second-order analysis based on the method developed by Bernstein etal is used for ABX system.The parameters of coupling constants (3J9a, 10a = 11.46 Hz and 3J9a, 10e =2.46Hz) and origin of chemical shifts (__ampersandsignupsilon;A=1.77 and __ampersandsignupsilon;B=1.86ppm) are calculated using ABX system from which also found that the title molecule adopt chair conformation. These results also confirm that the substitutions of Phenyl and methyl groups are in equatorial position of the six memberd piperidine ring of the title compound. The Biological (antibacterial and antifungal) activities of title compound have also been studied.