The classical construction of the peptide library is the phage-display technology, but with this method, every peptide in the peptide library can not be expressed solely and screened on basis of its function and structure. Further value of the peptide library can not be implemented in the extensive application and comparison. Purpose of our research is to construct a peptide library with the method of the gene-engineering technology which is distinguishing to the phage-display technology. In this peptide li...