Abstract: Digital microfluidics based on electrowetting on dielectric is an emerging popular technology that manipulates single droplets. It has shown enormous advantages in biology, medicine and chemistry and so on, where it has been used extensively. However, the higher driving voltage of digital microfluidic devices not only causes the dielectric layer of the chip to be broken down, but the strong electric field can cause irreversible damage to the active material in the droplet. Therefore, it is necessary to reduce the driving voltage of the digital microfluidic device. Compared with the two plate structure, the twin plate device composed of two identical coplanar electrodes was obtained by theoretical analysis, which can not only achieve greater driving force, but also lower the threshold driving voltage. The experimental results demonstrate that the twin plate structure can improve the average velocity of droplets and reduce the driving voltage effectively. Especially, in the lower driving voltage a better droplet driving effect can be obtained with the twin plate structure.