MCM 41 mesoporous molecular sieve was synthesized by microwave radiation method. The crystallization, crystalline morphology and stability of MCM 41 were investigated by means of XRD, SEM, IR, NMR and adsorption technique. The results showed that the induction period is very short, the crystallization rate is very high, and there is no crystalline conversion during the crystallization process. It was also found that MCM 41 synthesized in microwave condition had lower adsorption capacity but better abilit...