Cobalt containing mesoporous molecular sieve SBA-15 with different silicon to cobalt mol ratios have been synthesized by various methods. The samples were characterized by XRD, TEM, BET, FT-IR and ICP-AAS. The effect of cobalt salt addition sequence to solution, such as after polymer and after silica source were studied to observe stability of mesoporous structure. Same composition of cobalt containing SBA-15 materials were prepared by wet impregnation method.The sol-gel derived composite with cobalt salt added after polymer is more stable in the structural regularity of mesoporous material than the cobalt salt added after silica source and the wet impregnated sample. Although the powder XRD pattern of Co containing SBA-15 samples display characteristic peaks of Co3O4 TEM measurements did not indicate presence of nanaoparticles. This behaviour of samples proves the high dispersion capacity of cobalt oxide nanoparticles in SBA-15 mesoporous silica material.