It is investigated whether composite particles composed of waste polymer and solid powder are able to be prepared by using a semi-chemical recycle method. In the experiment, polystyrene pellets as waste polymer, dichloromethane as the solvent and magnetite as the solid powder are adopted. This solution of the dispersed phase was dispersed into fine droplets in the continuous water phase. In the case of the lower impeller speed and the lower temperature for removing the solvent, composite particles coated with solid powder can be prepared. However, with increasing impeller speed and temperature, the dispersion became unstable and then the composite particles can not be prepared.