Abstract: A new classified lumped model for aromatic extraction feedstock was proposed. And by strict steady-state simulation of DWC and lumped model, the column structure parameters and operation conditions were determined, resulting in the side stream withdraw ratio less than 75%, benzene in the top stream less than 1 %(w), and the yield of C6-C8 fraction in the side stream reaches 99%. Using Aspen Dynamic, a dynamic control structure with three control loops and feedforward controllers was established. The dynamic simulation shows that dividing wall column is a good way to complete the separation of target products; and the temperature control strategy with feedforward can be very good in dealing with feed composition and flow rate fluctuations, the stable time is shorter and the qualities of the products conform to the requirements of the separation.