A novel and simple method for preparing composites of PDMS/PS core-shell emulsion and polystyrene was reported. This method was based on emulsion and suspension in situ polymerization. The relationship between the process of core-shell emulsion breaking and electrolyte concentration was studied by spectrophotometry. The results of transmission electron microscopy showed that polydimethylsiloxane soft particles were dispersed uniformly in the composites. Diameters of the composite beads ranged from 0.5 to 4.0 mm, which could be controlled by adjusting the amount of hydroxyapatite. At last, the properties of the latex film including water absorption ratio, con-tact angle, pendulum hardness and transparency were tested. The results showed that the content of emulsion obvious affected the properties. During the process of emulsion and suspension in situ polymerization, the contact angle of the latex films ascended to 106.06 degrees and the transmission ratio at 500 nm decreased to 0.3 with the increasing of core-shell emulsion. Whereas, the absorption and pendulum hardness fell to 0.37% and 322 S, respectively. (c) 2007 Wiley Periodicals, Inc.