5'-Amino-2',4'-BNA, a novel analogue of BNA series compounds, was synthesized and its incorporation into oligonucleosides via P3'-->N5' phosphoramidate linkage was successfully achieved on a DNA automatic synthesizer. The 5'-amino-2',4'-BNA modified oligonucleotides were found to have a potent hybridizing affinity for the single stranded RNA and double stranded DNA complements, and also to show a good resistant ability against SVPDE.