Abstract: Questions of improvement of methodology of an assessment of efficiency of the agricultural companies on the basis of the deterministic and stochastic approaches of measurement (DEA and SFA methods) are investigated in the study. Activity of these companies is caused by a set of administrative influences and environment factors. Researchers approach to carrying out the mixed assessment of efficiency is offered. Basic experiment of applicability of researchers approach is made at the agricultural enterprises of Kulunda Steppe of the Altai Region of Russia taking into account climatic and social and economic conditions.