Poly (glycidyl methacrylate)/silica (PGMA/silica) composite nanoparticles, containing epoxy functional groups on the surface, were synthesized via emulsion polymerization. With batch process, high yield and binding efficiency (both around 90%) were achieved. The amount of crosslinked GMA was approximately 8wt%-14wt% to the polymerized monomer. It was found that both the encapsulating ratio and the number of the original silica beads per composite particles altered with the amount of silica added. The obtained particles, with their average particle size of about 60-70 nm, had a spherical shape and a clear core-shell structure.