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Аннотация In the present work the comparative analysis of the far-UV region (200-230 nm) in circular dichroism spectra of DNA in some DNA-protein systems and in 80% trifluoroethanol solution has been done. The common tendencies in spectral changes of all systems under investigation have been observed. It has been shown that DNA in 80% trifluoroethanol solution has different conformations at low (15 mM) and high (150 mM) NaCl concentration. Higher sensitivity of circular dichroism bands in far-UV region to small variations in structure has been shown as compared to the traditional DNA circular dichroism bands in 240-280 nm region. The hypothesis is proposed summarizing the phenomena of ordered supramolecular structures in all described systems