Abstract: Now as the isolating environment, an alternative to a mineral oil, oils on a vegetable basis are considered. Quality of the electroisolating environment is defined by its dielectric indicators, the most important of which are the inductivity, dielectric loss, specific volume resistance. In work changes of dielectric oil indexes on a vegetable basis in the course of the artificial accelerated oxygen aging are investigated. Dielectric indexes were measured: inductivity, dielectric loss, specific volume resistance. The analysis of the received results is carried out, analytical dependences are received.