A technique of determining the thermal conductivity coefficient of superhard materials based on the solution of inverse thermal conductivity problems is presented. The design of a heat receiver is developed, in the form of a model comprising thermocouples for experimental determination of a one-dimensional temperature field under the conditions of unidirectional heating. The model is formed from three or four plates (provided with thermocouples) connected together by means of high-temperature cement. Using samples of hexanite-R as an example, application. of the newly developed technique for determining the temperature dependence of the thermal conductivity coefficient of the particular material is demonstrated. The technique does not entail the destruction of the plates of superhard materials. Following the tests, the plates may be used for the manufacture of cutting tools.