Organically modified montmorillonite was prepared respectively via mortar grinding,solution stirring and microwave heating,with sodium montmorillonite as the matrix and with γ- aminopropyl triethoxysilane (KH- 550) as the modifying agent.Then,the samples before and after the modification were characterized and analyzed by means of FT- IR,XRD,TG,SEM and UV- Vis.The results show that (1) the mortar grinding method helps to realize the intercalation modification of the amino compound of montmorillonite and is more effective than the solution stirring method and the microwave heating method; (2) after the modification via mortar grinding,the (001) interlayer spacing of sodium montmorillonite improves from 1.07nm to 2.42nm; (3) the organic load rate of organic montmo-rillonite prepared via mortar grinding is the highest and the mass loss of montmorillonite at 700 ℃ is up to 16%;and (4) mortar grinding helps to prepare modified montmorillonite with uniform dispersion and strong stability in organic solvents.