Organobentonite was synthesized by placing cetyltrimethylammonium bromide (CTMAB) surfactants into montmorillonite layer in bentonite. The factors affecting the capacity of organobentonite for adsorbing such organic contaminants as phenol, aniline, benzene, toluene and xylene from refuse percolate were investigated, and the laws governing the adsorption of organic contaminants are summarized. It is shown that the key factor affecting the adsorption of organic contaminants by organobentonite is the amount of the modification reagent. When the amount of modification reagent is identical, the ability of organobentonite with Na is obviously better than that of 6% directly-modified organobentonite, and the influence of organobentonite prepared by heat treatment on adsorbing organic contaminants is different from that prepared by acid treatment. The organobentonite can be used to build liner of landfill.