Abstract: Capacitive fingerprint sensor is one of the standard specifications of many electronic devices. It is a common engineering item for mobile phones, laptops and other electronic products that the sensor and mobile terminal shell structure keep in the same horizontal plane and color matching, and do not reduce the sensitivity. Based on previous literature, the structure of a full plane fingerprint sensor with exposed color coating on the sensor sensing surface is researched. And the feasibility of the structure design engineering is verified by experiment. Finally, this paper discussed the further optimization of the above work.