The experimental tilapia(Oreochromis nilotica)were fed with dietary eel diet containing different microcapsuled-vaccine(anti-Strep. iniae) and dry microcapsuled-probiotics powder for 14 days(28-30℃), and challenged with Strep. iniae. It was showed good protect effect in five experimental group inclucing m*-vaccine with m*-Bacillus sustilis、m*-vaccine with m*-Rhodobacter sphaeroides、m*-vaccine with m*-Enterococcus faecalis、m*-vaccine with m*-Lactobacillus acidophilus、and m*-vaccine with m*-Micrococcus luteus.