The preparation of alumina sol for fine chemical field from kaolin-derived aluminum sulfate solution is performed. Noncrystalline AlO(OH) was prepared by dropping ammonia water into aluminum sufate solution with stirring. Acetetic acid was added to form the electrical double layers on the particle surface of the slurry, which resulted in a stable sol. The influence of the reaction temperature, reaction time, acetetic acid concentration on the preparation of alumina sol were investigated. Dispersed colloid particles of AlO(OH) were prepared at the reaction temperature of 50∼90℃ and 1.6 A/C = 1.6 (molar ratio), regardless of the reaction time. Stable alumina sol having a particle size of about 5∼10 nm was prepared in the range 1∼5 vol% alumina content.