GD glycoprotein is the main molecular of which IBRV infect cells ,and it plays an important role in absorbing and invading of host cell.Using IBRV genomic DNA as the template,a 786 bp fragment of glycoprotein D gene was amplified by PCR with specific primers.The PCR product was cloned into pET32a(+) vector and expressed in partially soluble form in E.coli after induction of cultured E.coli BL21(DE3) with IPTG.The fusion protein was purified by immobilized Ni NTA resin under native conditions.Immunize the New Zealand rabbits with purified protein so as to prepare the antisera;The titer of the rabbit antibody which prepared by pET32a gD was 1∶6 400;The result of serum neutralization test is 1∶640,this antiserum shows good anti virus ability.This research will lay a foundation for further studies on diagnostic reagent and bacterin of IBR.