The morphologies and the microstructures of the dispersed particles of the cubic phase,which were formed by precursor method, were studied. The freeze-fracture TEM clearly showed that the aqueous dispersed particles have irregular cubic shapes. X-ray diffraction technique has been utilized to study the microstructure of the particles and it was found that these particles still retained the cubic character. The sizes of the particles were measured by dynamic light scattering,and the results showed that the sizes of the dispersed particles were between 200 ～ 400 nm under different conditions.