The literature indicates that silica prepared in the emulsion system was surrounded by the organic phase, and the organic phase decreased the extent of agglomeration of colloid silica. The colloid silica reasonably formed spherical shape in order to reduce the sur-face tension. The main aim of this study was to obtain silica of spher-ical particles in the process of precipitation using SiCl4 in the micro emulsion system; we also intend to study the effect of micro emulsion systems on the shape and structure of silica.