Abstract: The deactivation formaldehyde solution bacterial vaccine which comes from Aeromonas hydrophila,which has the strangest poisonous effect to Brazilian Chinemys reevisii.The result indicates that all the targets of the immuned group are obviously higher than that of compared group through the check of their leukocytic pyagocytic effect,serum antibody valence and aggression paternity test. And the immunocompetence of the immuned group is over 81 percentage.But the immunocompetence of the soaked group is lower t...