Due to its small particle size, large specific area, high surface activity and poor stability, the memory between particles is reunified, and a series of excellent properties caused by nano effect will be weakened or lost. In order to improve the dispersion of nanoparticles in media and matrix, improve the compatibility between nanoparticles and matrix, enhance the interface binding force between nanoparticles, and expand the application scope and field of nanoparticles, it is necessary to change the surface activity of nanoparticles by surface modification