Abstract: The antimicrobial property of the jujube pigment on several common spoilage bacteria was determined by using filter paper dispersion method in this paper. The influence of several factors,including temperature,p H,ultraviolet radiation,and the synergistic inhibitory effect of sucrose,Na Cl and common preservatives were studied.The results showed that the jujube pigment had an obvious antimicrobial effect on staphylococcus aureus and streptococcus,the minimum inhibition concentrations( MIC) were 0.01 and 0.02 g / m L respectively. Under the alkalinity environment the red jujube pigment was proved to have a good antimicrobial activity at 20 ~ 40 ℃ and25 min ultraviolet irradiation had no significant effect on the antimicrobial activity.Besides,it had a good synergistic effect of jujube pigment and sucrose,Na Cl.Furthermore,jujube pigment had some antiseptic functions on food,it is an ideal natural preservative.