The non-contact electrocardiogram (ECG) sensing technology has a promising application in the field of long-term sleeping ECG monitoring. The non-contact ECG sensing technology based on array electrodes has made good progress. However, the current noncontact ECG sensing electrodes based on array electrodes are mostly manufactured by using the hard printed circuit board technology, which has low comfort. Meanwhile, the relationship between the human body pressure distribution and the signal quality of non-contact ECG sensing based on array electrodes is not studied in this aspect based on our best knowledge. To address those issues, this study develops an arrayed non-contact ECG sensing electrode based on flexible printed circuit (FPC). The experimental results show that the ECG signals obtained from the proposed system are high, and the averaged signal-to-noise ratio is larger than 38 dB. Moreover, the effect of pressure distribution of human back on the ECG signal quality is analyzed by conducting the human trials. The results demonstrate that the obtained ECG signal quality is relatively low when the electrode unit with human body pressure is lower than 9 mmHg used as one of the positive or negative ECG signal input units. The probability for obtaining ECG signals with lower quality is higher than 54. 17% . When the unit pressure is higher than 9 mmHg, the probability for obtaining ECG signals with lower quality is lower than 5. 94% . It proves that the unit pressure is one of the key factors that can affect the quality of capacitive ECG signals.