Dehydration processes of series of rhenium cluster compounds were studied (by thermogravimetry, differential scanning calorimetry, dilatometry methods). Cluster anions of compounds are [Re6S8Br6]3−, [Re6S7Br7]3−, [Re6S8(OH)6]4−, [Re6Se8(OH)6]4−. TG- and DSC-data were used for kinetic studies, these data were processed using special computer program with ‘model-free’ approach. Quantitative data on thermodynamic and kinetic stability of compounds are obtained. The role of water molecules in the cluster compounds stability is discussed.