Abstract: Talc powders were surface modified with a titanate coupling agent, and polystyrene (PS)/surfacemodified talc powder compounds were prepared via mechanical mixing.Selective laser sintering parts based on these compounds were molded at a preheating temperature of 85 ℃ with 8layer grid support.Effect of layer thickness, scanning interval, laser power and scanning speed on bending strength of the sintering parts were studied by an orthogonal experiment.The results indicated that a chemical reaction occurred between functional groups of titanate coupling agent and active matters on surfaces of talcum powders, indicating that talcum powders achieved a successful surface modification.An investigation of process parameters indicated that effect of laser power on bending strength of the specimen was significant, but influence from layer thickness was little.Optimal process parameters for the sintering parts were a layer thickness of 018 mm, a scanning interval of 028 mm, a laser power of 27 W and a scanning speed of 1200 mm/s.With these process parameters, the sintering parts achieved bending strength of 1527 MPa.