AbstractOn the example of analysis of 53 soybean oil samples an estimation of the usefulness of thermoanalytical methods for the quality inspection of this product has been made, and as well as a method to make possible carrying out the tests which allow to evaluate the stability of soybean oils in technological processing and during their storage. The existence of strong relationship between the values of the temperatures of successive weight losses and the values of the parameters of physico‐chemical quality assessment of soybean oils has been stated. The possibility of practical utilization of regression equations for the assessment of the degree of deterioration of oil products has been indicated.