Abstract: The fragment of G gene isolated from spring viremia of carp virus (SVCV, 0504) was cloned into the pET-28a(+) vector. The aimed protein was expressed after induction and lysed by concentration,then the G inclusion bodies were purified with Ni-NTA affinity column and renaturalized by the urea dialyzation way. The Balb/c was immuned by the recombinant glycoprotein and prepared for monoclonal antibody. Two hybridoma cell lines that secreted anti-G MAb were obtained successfully, named as 1C5, and 2D5. Western-Blot showed that the MAbs reacted specifically with recombinant glycoprotein, which laid foundation for the establishment of the new SVCV detection methods.