Abstract: 393 pig serum samples were collected randomly from 33 farms in 5 regions，these pigs had been vaccinated PRRSV，CSFV，PRV vaccine. The antibody level of these serum samples were detected with immune colloidal gold technique. The results showed that the highest ratio of positive antibody in different scale of farms was CSF(75.06%)，follow by the PR(71.25%)，the lowest was PRRS(42.24%). Antibody level was various from different scale of farms，antibody level in large scale farms was not necessary higher than the dispersive. Compared the antibody level which vaccinated by different kinds of vaccine，there were no significant difference in the following respectively: inactivated and attenuated PRRSV vaccine，rabbit origin or cell origin CSFV vaccine，homemade and imported PRV vaccine.

Key words: PRRS; CSF; PR; antibody surveillance