Fibrous potassium hexatitanate whisker was produced through the flux method using a mixture of the natural rutile ore, industrial K₂CO₃, and industrial K₂MoO₄ in an attempts to reduce the fabrication cost. The optimum condition for the synthesis of potassium hexatitanate whisker was the reaction temperature of 1050℃, reaction time of 5 hrs, rutile ore mole ratio to K₂CO₃ of 5.5, and flux mole ratio to mixture (K₂O+ nTiO₂) of 4.0. Also the proper water leaching condition for removing of K component was a multiful of 40 for wafter quantity and 8 hrs for leaching lime in boiling water. In this condition, synthisized potassium hexatitanate whisker was a fibrous crystal of 17㎛ of average length and 0.5㎛ of average diameter. Potassium hexatitanate whisker was stabilized after 60 days at 1N HCl.