Aiming at improving the energy efficiency of the pickling-cold rolling production line， an energy flow method was introduced to establish energy model for the production lines， to analyze the real time power required by each machine. To verification the accuracy of the model which includes parameters relevant of rolling mill， a full line motor model and power meter provided by a cold rolling mill was substituted into the model to calculate required power of a machine， and the results were contrasted with the motor capacity of the machine. Finally， with the lowest energy consumption and good strip shape as the optimization goal， processing parameters of power model were multi-objectively optimized and an improved PSO was designed to solve model for getting final optimization results.
