A hydrosol of coexisting AgCl and Cu2+ was prepared by the precipitation method. The organosol of coexisting AgCl and Cu2+ was obtained by using oleic acid to extract and modify the nanoparticles in hydrosol, TEM photos showed that the AgCl nanoparticles were spherical in shape, and about 50nm in size. The particle size distribution was narrow and no agglomerates were observed. ED imaging indicated that the AgCl nanoparticles were polycrystalline in structure, and some of AgCl existed as monocrystalline particles. AgCl nanoparticles coated with oleic acid easily dissolved in weak polar solvents, but would not dissolve in polar solvents.