Abstrast. The task of the study is to create the measures and methods of efficiency definition of new functional task in electric arc furnace control system. The method of system analysis was applied. The research was carried out in the shops of Magnitogorsk Iron and Steel Works (MMK). Method of efficiency definition of new functional task module in electric arc furnace control system was developed. The capacity loading reduction of bucket quantity and materials in charging process in the electric arc furnace for any planned task was presented.