Abstract: A murine phage antibody library was constructed.First,the total RNA was extracted from fresh spleens of nonimmunized mice,then the cDNA library was achieved via reverse transcription PCR.Gene fragments encoding V_H and V_L were amplified and assembled into a single gene using a DNA linker encoding a polypeptide of 15 amino acid residues(Gly4Ser)3 through PCR.And finally the recombinant DNA fragments were cloned into the phagemid pCANTAB5E vector and introduced into E.coli TG1.The phagemid particles displaying functional ScFv were rescued by reinfection of helper phage M13K07,thus a murine antibody library was obtained.