The monodispersed cross linked GMA-DVB particles were prepared by dispersion polymerization using PVPK as stabilizer, water/alcohol mixture as reaction medium and BPO as initiator. The influence of different ratio of water/alcohol, the proporition of the monomer and medium, the concentration of the initiation and the effect of mix speed on the micropheres' shape, yield, diameter and its distribution was investigated. Polymerization process was tracked and observed by microscope to summarize and grope the polymerization mechanism of dispersion polymerization. The monodispersed cross linked GMA-DVB particles have the diameter of 3～5?μm.
