A polymerase chain reaction (PCR) in water droplets with water-in-oil emulsion (emulsion PCR) facilitates parallel amplification of a single-molecule template. The amplified DNA can be immobilized onto microbeads bound to primer DNA. The product, termed a "bead library", has various applications such as next-generation sequencing (NGS) and the directed evolution of various functional biomolecules. Here, we describe a method for genomic library construction on microbeads using emulsion PCR.