Abstract: Shear thickening fluid (STF) which used silicon dioxide as dispersed phase and the polyethylene glycol（PEG）as dispersed medium is studied in the present paper.STF with mass fraction of 10%，15%，20%，25%，30%，35%，40%，45% are studied in steady measurement .It was obvious that when the shear rate is relatively low, its viscosity will reduce and when the shear rate is relatively high, the viscosity will increase according to the rising of shear rate.Two curves of STF stayed similar,which indicated STF have the reversibility of shear thickening.

Key words: shear thickening, process, rheological property, silicon dioxide