Objective: The fermentation conditions of Pseudoalteromonas sp.JIV-49 were studied.Methods:The fermentation medium and main influence factors of Pseudoalteromonas sp.JIV-49 was investigated with single-factor test.Results: The results showed that the optimal fermentation medium were obtained as follow: NaCl 6%,beef extract 2.5%,potassium bromide 0.01%;the optimal fermentation condition were obtained as follow: initial pH value 7.5,temperauture 30℃,fermentation time 96h,seeding volume 7%,rotated speed 180r/m...