Zinc oxide fine particles were prepared from aqueous solutions of zinc nitrate in the presence of hexamethylenetetramine by homogeneous precipitation method. The rate of conversion change and the equilibrium conversion of zinc increased with the increase in R values and temperature, and with the decrease in initial pH of the solutions but initial concentration of zinc had only minor effect on them. Various shapes of zinc oxide fine particles were formed in relation to the precipitation conditions such as, concentrations of zinc nitrate and hexamethylenetetramine, temperature, pH of initial solution and aging time. The initial microcrystalline particles are approximately spherical with an average size of 1㎛, but they formed embryonic particles by coupling together and grew up. Spherical particles with a relatively narrow size distribution could be obtained when the concentration of zinc ion and R value were both high.