The present paper deals with the synthesis of peptide Ⅰ (N-carbobenzoxyglycyl-L-isoleucyl-L-valyl-γ-tert-butyl-L-glutamyl-L-glutamine carbo-,ert-butoxyhydrazide) and peptide Ⅱ (N-carbobenzoxyglycyl-L-isoleucyl-L-valyl-L-glutamyl-L-glutaminyl-S-benzyl-L-Eysteinyl-S-benzyl-L-cysteinyl-L-alanyl-L-serine hydrazide), which are protected N-terminal penta-and nona-peptides of the A-chain of bovine insulin respectively.