Abstract: The antibacterial properties of Ag-carrying montmorillonite against colon bacillus, staphylococcus aureus, gas bacillus, hay bacillus, brewer's yeast and candida albicans were confirmed by test-tube experiment oscillation, meanwhile the water resisting property and durability experiment of Ag-carrying montmorillonite were also investigated.The results show that this kind of material reveals effectively bacteriostasis and disinfection ability when the the content of Ag carried on montmorillonite amounts to 2.5%-3.40%. Ag-carrying montmorillonite possesses broad-spectrum antibacterial property. It is not easily decomposed and becomes invalid. Moreover，the antimicrobial agent is long lasting and exhits good water-resisting property.

Key words: inorganic antimicrobial agent%Ag-carrying montmorillonite%antibacterial properties