From the point of view of resistance, inductance and capacitance in physics, this paper firstly analyzed the similarities of their characteristics to various Mass Customization (i.e. MC) product costs, under the idea of overall product. Then, the conversion model between them was set up according to these similarities. Through making using of the system description method in Modern Control Theory, the system state equations of RLC series circuit were introduced. And meanwhile, the MC product cost optimization model based on Modern Control Theory was set forth. Finally, an example was given to illustrate the method put forward here, and some effective results were obtained.