Abstract: The coding sequence(CDS) of a new C-type lectin(AJL) was cloned and characterized from the sea cucumber Apostichopus japonicus by rapid amplification of cDNA ends(RACE) to exploit recombinant protein of sea cucumber by expression of immune gene and recombinant immune factors.The CDS contains 492 bp with encoding a polypeptide of 163 amino acids.The mature peptide contains 143 amino acids.The recombinant p ET-32a(+)-AJL was constructed by linking the mature peptide gene sequences and p ET-32a(+) vector.After transforming the recombinant into Escherichia coli BL21(DE3),the fusion protein was obtained by induction,separation and purification.The findings provide the good foundation for further research and application of the recombinant lectin in sea cucumber culture.