Abstract: A pair of primers were designed and synthesized according to the interleukin-1β (IL-1β) gene sequence (GenBank accession number is AY669059) of the yellowfin seabream Acanthopgrus latus (Houttuyn). The plasmid pMD18T-IL1β was constructed after amplifying open reading frame cDNA sequence of the IL-1β gene by RT-PCR. The sequence of pro-peptide and predicted mature peptide were linked into expression vector pQE30 and two recombinant plasmids pQE30-pIL1β and pQE30-mIL1β were constructed. Restriction analysis, PCR amplification and sequencing demonstrated that the target fragments were inserted into pQE30 correctly.