In this study, a homogenously dispersed finer SiC particles-containing ZrB2 composite was prepared using nanosized polycarbosilane (PCS) particles-containing ZrB2 mixture powder, followed by hot pressing. The microstructure of the resulting composite was characterized by field-emission scanning electron microscopy and transmission electron microscopy. The composite microstructure comprised finer equiaxed ZrB2 and SiC grains. The mechanical behavior of the composite was evaluated using four-point bending test at different temperatures between room temperature (RT) and 1600 degrees C. The results show that the composite exhibited only linear deformation behavior prior fracture at or below 1500 degrees C. However, a trace quantity of nonlinear deformation was observed at 1600 degrees C. In addition, the flexural strength of the composite decreased as the temperature increased from RT to 1200 degrees C, then the strength increased as the temperature raised to 1400 degrees C. Subsequently, the flexural strength remained almost the constant between 1400 degrees C and 1600 degrees C, with a strength of similar to 760MPa.