Exopalaemon carinicauda, which was named is 645 bp, which contains a 184 bp 5′-UTR (untranslated region), 116 bp 3′-UTR, and 345 bp open reading frame (ORF) that encodes 114 amnio-acid polypeptides, which has the molecular mass of 12.85 kD and isoelectric point (pI) of 8.75. Homology analysis revealed that the amnio acid sequences of EcDAD1 had highly identifies with DAD1 of other species, for example, it had 92% identity with DAD1 of , and had 73%−80% identities with DAD1 of other invertebrates. The phylogenetic analysis showed that . The expression level of gene in different tissues were analyzed by quantitative real-time PCR. The results showed that hemocytes, gill, hepatopancreas, muscle, ovary, intestine, stomach and eye stalk, and the the highest expression level of gene was in ovary and white spot syndrome virus (WSSV), the relative expression level of might play an important role in the prawn immune system.