This article analyzes the main problems associated with the estimation of the effect of space factors on the change in the optical properties of thermoregulating coatings (TRP) of the class «solar reflector» used on modern space vehicles. It is shown that the degradation of the functional properties of TRP based on filled polymer composite materials and radiation-resistant glass K-208 under the action of space factors is caused by the formation of color centers both in the filler and in the organic binder, as well as the appearance in the glass of radiation- stimulated defects as a result of electrostatic discharges under the influence of PCF. Analysis of the results of studies of numerous works of scientists from different countries showed that at present there are no content models describing the changes in TRP properties in the space environment, taking into account the basic physico-chemical processes that determine the degradation of TRP.