We have examined the interactions between m-AMSA and CT-DNA, using melting profiles and viscometric techniques methods. We observed the increase of thermal stability of DNA after binding m-AMSA, depending on the concentration of the ligand in the solution. The maximal increase of the melting temperature of the m-AMSA/DNA system in comparison to pure DNA, was 6 o C for the concentration of m-AMSA to DNA of 0,5. Viscometric examination of interaction of m-AMSA with DNA unambiguously indicate intercalation type of bounds. In the saturation state, 2,76 base pairs occur for one ligand molecule.