Abstract: Response surface methodology and kinetic analysis were introduced to study the process of cultivating micro power aluminum hydroxide by liquid precipitation process. The results from the response surface methodology show that the most important factor influencing median diameter is the reaction temperature， followed by reaction time， amount of dispersant and pH value， and the most important factor influencing fractal dimension is the amount of dispersant， followed by the pH value， reaction temperature and reaction time. According to the analysis of kinetics， aluminum sulfate and ammonia reaction process is divided into the crystal nucleus growth and grain growth period. The equations of crystallization kinetics accord with the secondorder reaction rate equation， and the apparent activation energy are 051 and 127kJ/mol， respectively. Crystal growth mechanism research indicates that diffusion control mechanism determines the crystal nucleus growth and crystal grain growth.

Key words: response surface methodology, micro power aluminum hydroxide, kinetics, crystal nucleus growth, crystal grain growth