In order to improve the stability of water-based fluid magnetic abrasives, sodium hexametaphosphate(SHMP)and PAA were selected as complex dispersants, nano-Si O_2 was used as a adjuvant. The surface of solid phase particles in suspension was modified and the mechanism of its stability was studied. The single solid particles were analyzed to characterize its physical properties on a micro level, and the stability of the modified water-based fluid magnetic abrasives was studied with sedimentation rate and zer...