Abstract: The electrorheological(ER) behavior of the water-free suspensions made of modified titania(TiO₂) doped with rare earth(RE), synthesized by means of Sol-gel technique, in polydimetyl-silicone oil has been investigated under a DC field. In particular, the temperature dependence of the induced shear stress of ER suspensions has been studied carefully. In the results, it can be found that pure titania based ER fluids have almost no ER effects, but modified titania based ER fluids have a strong ER effect. The strong ER effect can be kept in the range from 10 ℃ to 100 ℃ in modified titania based ER fluids, the induced shear stress increases with temperature and reaches the maximum at 80℃. But the induced shear stress of pure titania based ER fluids reaches the maximum at 40 ℃, and then declines quickly. In addition, the remarkable characteristic is that the induced shear stress has a dependence on RE/Ti mole ratio and reaches a higher ER effect when RE/Ti mole ratio is about 0.07~0.11 at different temperatures. This can be explained by the dependence of dielectric properties of ER fluids on RE/Ti mole ratio.