Modern epoxy resins are complex multicomponent systems, an important role plays in which the mutual compatibility of the components. In this regard, this work describes the study of the process of dissolving in the epoxy oligomers of different chemical nature of the aromatic polysulfone PSK-1 and polyarylsulfone PSFF-30. Using differential scanning calorimetry and rotational viscometry values of the temperature intervals and exothermic thermal effects of dissolution of polysulfones in diane, novolac and nitrogen-containing epoxy oligomers. It is established that the curves of differential scanning calorimetry it is possible to allocate two stages: step change in heat flux corresponding to devitrification epoxy oligomer and the process of dissolution of PSF in the epoxy oligomer characterized by appearance of exothermic peak. It is shown that in repeated measurements of the exothermic heat effects are absent, which suggests the formation of a homogeneous system. Analysis of the results of differential scanning calorimetry showed that the mixture of diane epoxy oligomer is characterized by an exothermic heat effects 10-15% higher compared to the novolac and nitrogen-containing epoxy oligomers. Moreover, halogen-containing oligomer, the value of the heat effect up to 20-30%, depending on the brand used thermoplastics. The result of rheological studies have found that the process of dissolution polysulfones occurs in the temperature range of 60-110C and is accompanied by extrema in the dependence of viscosity on temperature. In this case the experimental values of the temperature of dissolution obtained using the method of differential scanning calorimetry and rheological measurements correlate well with each other. Analysis of patent and scientific and technical literature shows that the introduction of large quantities of powder composites in the hot melt epoxy oligomers leads to a decrease in the temperature of the mixed system. Therefore, there is a need for adjusting the portioning and taking into account the scale factor. The obtained results can be used in the development of industrial technology of manufacturing of epoxy binders modified with polysulfone.