With the continuous development of wearable health monitoring technology, new types of Electrocardiogram (ECG) electrodes become the focus of attention, such as textile electrode, non-contact electrode, and micro-needle electrode. However, there are not yet unified performance testing methods for different types of electrodes. Two evaluating indicators proposed in the national pharmaceutical industry standard YY/T 0196-2005 (disposable ECG electrodes) are DC offset voltage and AC impedance. In t