Recombinant Anti-BAFF x Anti-B7RP1 Bispecific Antibody (Triple Body) is designed to be expressed as two polypeptide chains respectively. The Fd fragment and LC from an anti-BAFF antibody are both extended with the scFv fragment from an anti-B7RP1 antibody. This BsAb can bind and inactivate two ligands simultaneously. It can inhibit B cell survival and T cell costimulation. It is designed for the research of Systemic lupus erythematosus (SLE) therapy.