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To study the surface modification of SiC powders with aminoorganosilanes, high solid loading and low viscosity SiC slurry was prepared. Three kinds of aminoorganosilanes were used in the experiment. Infrared Fourier transform spectrometry (Nicolet20SX, America) was applied to analyze the surface characterization of modified SiC powders. The largest solid loading of SiC coated with WD-52 slurry had increased to 54.5vol% and the stabilization also increased remarkably. At the same time, the viscosity of SiC slurry declined. Comparing with WD-50 and WD-57, WD-52 is most effective for modification of SiC powders.