Abstract:Compound hydrosol was prepared by using glucomannan phosphate monoester. It has good film-form－ ing， and overcomes the weakness of glucomannan membrane， which has low bacteriostatic effect， bad film-forming performance and easy moisture absorption. 0.4 % of glucomannan phosphate monoester compound hy－ drosol was the coating preservation hydrosol for this research， and its properties of the membrane was better than those of glucomannan membrane. Seven kinds of common microbes were experimented by 0.4 % of glucoman－ nan phosphate monoester compound hydrosol. Antimicrobial circle results showed that 0.4 % composite hydrosol had a certain antibacterial activity. It can be used in the coating preservation of fruits.