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The solvents recovering process in lubrication oil production needs a lot of energy, and has large stagnancy, strong coupling, time delay and interference etc. To measure the quality of solvents on-line is difficult. How to assure the quality and save energy is discussed. A non-linear predictive control is proposed frrstly. Because the mathematical model used for energy optimization can't meet actual need, a combined modeling and optimization strategy is then proposed. Intelligent database, adaptive modeling, combined control and optimization, expert control and intelligent alarming etc. are used to improve the function of the device clearly. Actual production results prove that the system is a great success.