The universal black box analysis model of oil depot equipment and grey box analysis model of total system are set up by applying three-box model theory of thermodynamics. On the basis of energy consumption analysis models and energy balance equations, the relevant energy consumption criteria are put forward. In accordance with production parameters of a certain oil depot in Daqing Oilfield, the evaluation criteria for energy consumption of oil depot system is accomplished to provide theory foundation for enhancing its energy consumption levels.