Fe2O3 sol with the particle diameter of 3-5 nm was flocculated by the addition of SDS, and the flocculate formed was redispersed by the further addition of that surfactant. Thus the surfactant bilayer was formed on the surface of Fe2O3. The emulsion polymerization of styrene（St） adsolubilized on the surfactant adsorbed bilayer was carried out by initiator potassium persulfate（KPS）. The UV-Vis and surface photovoltage spectra（SPS） indicate that the Fe2O3 particles were encapsulated in polystyrene（PSt） successfully.
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