Abstract: The fermentation of Ralstonia solanacearum FJAT-1458 used for production of plant vaccine was conducted in 50Lautomatic fermentation container,and the fermentation broth was prepared to produce with 2‰ agar to form a plant vaccine.During plant vaccine colloidal suspension agent storage process,the characteristics of strain FJAT-1458was detected under different pH values and different percentages of salt,and the control efficiency and attenuation index of strain FJAT-1458were also detected.The results showed that the best storage condition for plant vaccine colloidal suspension agent was pH 6-8and 2%-3% of salt.The Control efficiency of plant vaccine colloidal suspension agent against tomato bacteria wilt during its storage was stable and there was no significant difference between the attenuation in biological view.