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Hydrogen bonding interaction in hydrogen fluoride dimer has been investigated by quan-tum-chemical calculation with 6-311G~(**) basis set at various mutual orientations.Atomic charges andcharge transfer have been calculated by means of potential-derived method,and decomposition of hydro-gen bonding interaction has been executed.The calculation results show that there is a variation rangefor the energy-stable orientations,the charge transfer in the range presents maximum value,and the chargetransfer interaction plays a decisive role in the hydrogen bonding.