In order to obtain prokaryotic-expressed HPV16 L1 protein and develop gene engineering vaccine,an engineering E. coli pQ31-HPV16L1/M15(pREP4) was induced with IPTG and analyzed the induced products by SDS-PAGE and Western blot. The Ni2+ affinity chromatography was used to purify the His6-L1. BAL B/C mice were immunized with the L1 protein. A Mr 57ku target band was seen in SDS-PAGE that has specific reaction with monoclonal antibody of HPV16 L1 .The eukaryotic-expressed HPV16 L1 VLP was used to to confirm t...