Recombinant Anti-CD55 x Anti-HLA-A Bispecific Antibody (Fab-Fv) is designed to be expressed as two polypeptide chains. The heavy chain Fd fragment and light chain of an anti-CD55 antibody are fused with the VL and VH domains of an anti-HLA-A antibody respectively. It can form natural in vivo heterodimerization. This BsAb can recruit complements to tumor cells. It is designed for the research of Renal cell cancer (RCC); Solid tumors therapy.