Triclosan is a white crystalline powder with slight aromatic or phenolic odor, slightly soluble in water, moderately soluble in dilute alkali, soluble in ethanol, acetone and other organic solvents, and can be dissolved in surfactant to make a transparent concentrated liquid product. It has excellent storage stability, even slightly decomposed under long-term UV irradiation. Its solution is stable to acid and alkali with low volatility. Triclosan is an effective and safe disinfectant for external use in the world. It can kill Staphylococcus aureus, Escherichia coli and Candida albicans. It has the disinfection effect on pyogenic cocci and intestinal pathogenic fungi.