Secnidazole in recent years are widely used in abroad clinical safety, effective anti-anaerobic bacteria,Helicobacter pylori, Giardia, Trichomonas vaginalis and gastro-intestinal amoeba of 5-nitroimidazoles.In order to avoid gastrointestinal adverse reactions, and better to play the effect of oral administration, this paper carried out prodrug of secnidazole and the use of modified cyclodextrins for secnidazole to improve the solubility. We use secnidazole and its prodrug for pharmacodynamic studies...