Abstract: Clay complexly modified with inorganic and organic cations was used as the carrier of anionic herbicide 2,4-D, and its performance on controlling the herbicide’ s release was investigated. The aim of this research was to prolong the activity of 2,4-D, and reduce its pollution. The modified clay had much higher adsorbability, and could obviously slow the release of 2,4-D in both water and soil. The results of release kinetics in water indicated the time taken for 50% 2,4-D to be released was as long as 73.8 h, and much longer than that of organically modified clay (1 h) being used as the carrier. According to the release experiments in soil layer, the complexly modified clay has very good performance on controlling 2,4-D release when the loading amount ranged between 20~80 mg/g.