Abstract: A novel organic-inorganic hybrid nanocapsule was synthesized by mini-emulsion copolymerization of styrene and 3-trimethoxysilyl propyl methacrylate (MPS) on the well dispersed octane droplet templates.The morphology was characterized by transmission electron microscopy(TEM) and atom force microscopy(AFM).The microstructure parameters were characterized by gas adsorption instrument.The wall of the capsules was found to have microporous structures.According to these characteristics, a penetration model was established by using the percolation theory.The penetration diffusion coefficient was dependent on porosity and tortuosity.The kinetics of the penetration process was studied with ultraviolet-spectrophotometer and diffusion coefficient and tortuosity were calculated.Diffusion velocity increased with the increase of MPS content in capsules due to larger porosity;tortuosity was less in the cresol red-methanol system than in the anthracene-tetrahydrofuran system; and tortuosity nearly did not change with the MPS content in capsules. All these results were consistent with the percolation theory. The loading of the anthracene was also proved by infrared spectrometry, and the release diffusion coefficient was much smaller than that of loading, but did not change with the MPS content in capsules.