Objective] The passing rates of porcine reproductive and respiratory syn-drome virus （PRRSV） vaccine and classical swine fever virus （CSFV） vaccine were investigated in this paper. The PRRSV vaccine was injected in 14-d-old piglets and the CSFV vaccine was injected in 25-d-old piglets. [Method] The antibody expres-sion amounts were detected with the PRRSV antibody ELlSA detection kit and the CSFV antibody ELlSA detection kit. [Result] The antibody positive rates were 6.7%, 26.7%, 85% and 100% 3, 7, 14 and 30 d after the vaccination of PRRSV vaccine. While for the CSFV vaccine, 13%, 40%, 58.3% and 83.3% of the immune individu-als were antibody positive 3, 7, 14 and 30 d after the vaccination. [Conclusion] The PRRSV vaccine showed the lowest antibody tilter 3 d after the inoculation, but had a great vaccination effect 30 d after the inoculation. The piglets were not immune enough against viral invasion 3 d after the inoculation of CSFV vaccine. Although the antibody positive rate of PRRSV and CSFV vaccines al reached the required level by the Ministry of Agriculture （70%） 30 d after the inoculation, the vaccination of CSFV vaccine could not achieve the ideal effect of 100%.
