Disclosed herein is a phage-displayed single-chain variable fragment (scFv) library, which comprises a plurality of phage-displayed scFvs characterized in having a specific CS combination and a specific sequence in each CDR. The present scFv library is useful in efficiently producing different antibodies with binding affinity to different antigens. Accordingly, the present disclosure provides a potential means to generate different antigen-specific antibodies promptly in accordance with the need in experimental researches and/or clinical applications.