Double bond migration of butene-2 to butene-1 over ${eta}$-alumina was investigated. The effects of calcination temperature on catalytic properties were analyzed by applying BET surface area, XRD, $NH_3$-TPD, and FT-IR of adsorbed pyridine techniques. The highest activity of the ${eta}$-alumina catalyst calcined at $600^{circ}C$ could be attributed not only to the highest amount of weak and medium strength acid sites, but also to the highest ratio of medium to weak strength Lewis acid sites.