Abstract: With the perlite ore tailings as matrix, the surface of perlite was modified with silane coupling agents. It was shown that the SiOH exists on the surface of modified perlite. The adsorption test of the surface modified perlite was done for 2,4-dinitrophenylhydrazine. The research results indicate that the adsorption effect is obviously superior to the perlite ore tailings and the removal rate can reach above 84%