Nanocomposite material is less than 100nm size of reinforcement. This study is based on nano-TiO2 powder as filler which put into the MMA and fully distributed evenly in supersonic distribution machines and different content of BPO to make TiO2/PMMA nanocomposite. The increased degree of polymerization followed the increase of strength. And TiO2 depend on the time of shake so long, fully distributed evenly to good, have a good effect.