Recombinant Anti-VEGFB x Anti-VEGF Bispecific Antibody (Tandem scFv) is designed to be expressed as a scFv from an anti-VEGFB antibody variable domains fused with a scFv from an anti-VEGF antibody variable domains. It contains a His-tag at the C/N terminus for affinity purification. The BsAb exits as monomer in reducing and non-reducing conditions. This BsAb can block two proangiogenics simultaneously. It is designed for the research of Cancers therapy.