Abstract: Acrylamide modified titanium oxide nano particles were prepared by combining the modified hydrolysisand solution deposition methods , using sodium dodecylbenzene sulphonate (SDBS) as the dispersing agent . XRD result shows that the nano particles are amorphous , and the size dispersion ranges f rom 70 nm to 300 nm characterizedby the laser particle size analyzer. FTIR pat terns show that acrylamide and SDBS are adsorbed on the surface of titanium oxide particles. The addition of SDBS affect s the size and the surface characterization of particles , and the wettability between particles and silicone oil , which sequentially leads to the improvement of dielect ric property. Anexcellent elect rorheological activity has been found when the nano particles are dispersed into the silicone oil. Underan elect ric field of 5 kV/ mm , the shear st ress will reach 90 kPa , when the mass f ractions of acrylamide and SDBS are1. 875 % and 0. 750 % , respectively. The ERF also shows very good dispersion stability.