The viscoelastic behaviors of different ceria gelling systems prepared through sol-gel transition were investigated by the rheological measurement. The gelation time was observed by the frequency independence of tan delta, and increased with increasing acid:alkoxide molar ratio. At the gel point, both storage and loss moduli (G' proportional to omega(n), G" proportional to omega(n)) exhibited a power law dependence of applied frequency with n' = n" = n. The viscoelastic exponents and gel strength parameter were dependent on the composition of system. The increase in HCl:alkoxide molar ratio increased the n value while decreased the S parameter.