In this article are presented the results of scientific research on the CO2–extraction of oil from walnut crumbs. The walnut oil was extracted at different parameters of temperature (35–55°C), pressure (10–40MPa) and time (20–150 min.). Using the central rotational program of planning experiments it was established that it is necessary to perform 20 experiments (in parallel) so that the data obtained can be processed mathematically. It was established that the CO2–extraction of oil from walnut crumbs is adequately described by a polynomial of second degree. The most significantly parameter that influence the extraction process is the pressure. The maximum yield of oil was obtained at 40 MPa, 55°C and 120 minutes.