Recombinant Anti-CD32B x Anti-CD79B Bispecific Antibody (Fab-Fv) is designed to be expressed as two polypeptide chains. The heavy chain Fd fragment and light chain of an anti-CD32B antibody are fused with the VL and VH domains of an anti-CD79B antibody respectively. It can form natural in vivo heterodimerization. This BsAb can regulate B-cell modulation. It is designed for the research of Immune diseases therapy.