The current electrocardiogram (ECG) collection mainly uses wet Ag / AgCl electrodes, which need to be closely attached to the skin surface to obtain high quality signal. However, the hardening of conductive gel, irritation or damage of electrodes may cause to skin and the discomfort during utilization, which make Ag / AgCl electrodes not suitable for long term ECG monitoring. The capacitance coupling PCB electrode presented in this article is equipped with an AC bootstrap circuit and has a super high input impedance about 100 GΩ. Experimental results show that the PCB electrode can maintain a high coupling ratio for signals of different frequencies through multilayer insulating medium, and the actual input impedance is about 87. 26 GΩ. The similarity between the ECG signals simultaneously measured by PCB electrodes and Ag / AgCl electrodes is more than 91% . Finally, the influence of the lead position of electrodes, the parameters of the coupling medium and the motion state of the body on non-contact ECG measuring is experimentally studied. The measurement results demonstrates the proposed non-contact ECG measurement method based on capacitance coupling electrodes can effectively detect the main components of ECG signal and heartbeat rhythm under various situation.