K+-β"-Al2O3 in the K2O-Li2O-Al2O3 ternary system was synthesized using aluminum nitrate solution as a starting material. For the synthesis of pure K+-β-Al2O3, raw materials with chemical composition of 0.84K2Oㆍ0.082Li2Oㆍ5.2Al2O3 were mixed in solution state. The effects of dispersant and solution-pH were investigated in minimizing the particle size and on the synthesis of pure K+-β"-Al2O3. Ethanol was used for a dispersant, and NH4OH solution and nitric acid were added for pH adjustment. The solution pH was increased from 1.0 to 7.5 by 0.5 increments. Each sample was calcined at 1200 ℃ for 2 h and characterized with X-ray diffraction and particle size analyzer. The pH of solution significantly effected both particle size and phase formation, while the addition of ethanol only effected particle size. The synthesis of pure K+-β"-Al2O3 was favored by addition of nitric acid (for pH control).