Abstract: We did a research on how the field dynamic response characteristics affect the functional characteristics of Electrofluidic display devices based on Teflon AF1600 Insulating layer. Results show: Devices with a pixel unit capacitance which is significantly lower than the ideal capacitance are more likely to be damaged, and their opening rates are low. Devices with a pixel unit capacitance which is significantly higher than the ideal capacitance requires higher threshold voltages, and the opening rates are also not high enough. Devices with a pixel unit capacitance which is close to the ideal capacitance usually have better functional performances. High loss factors will lower down the accuracy of capacitance measurements. After samples being opened and tested we found that : For those devices with a low pixel unit capacitance, Na+ was found in them. Na+ changed their conductance connectivity, making their tolerances of high voltages become low and get damaged easier. For those devices with a high pixel unit capacitance, their insulating layers are too thin or bared at the edge, which makes them become insensitive at applied voltages, leading to higher threshold voltages.