the electronic ink microcapsules containing TiO2 nanoparticles modified with stearic acid dispersed in Tetrachloroethylene（TCE）were prepared by complex coacervation using Gelatin-Gum acacia as wall materials. The influence of SDS on complex coacervation was discussed. The influence of Span on surface morphology of the electronic ink microcapsules was also studied. The results showed there was high surface activity existed complex coacervation generated between SDS and gelatin. Furthermore, When the concentration of Span 80 increased to 2.0-3.0 %, the microcapsules can be prepared with regular morphology and transparent and smooth surface, the average diameter was ~60 μm. Finally, the particles in microcapsules possessed reversible response to dc under the electric field intensity of 2.5V/μm