摘要Electrocardiogram(ECG)monitoring is used to diagnose cardiovascular diseases,for which wearable electronics have attracted much attention due to their lightweight,comfort,and long-term use.This study developed a wearable multilead ECG sensing system with on-skin stretchable and conductive silver(Ag)-coated fiiber/silicone(AgCF-S)dry adhesives.Tangential and normal adhesion to pigskin(0.43 and 0.20 N/cm2,respectively)was optimized by the active control of fiber density and mixing ratio,resulting in close contact in the electrode-skin interface.The breathable AgCF-S dry electrode was nonallergenic after continuous fit for 24 h and can be reused/cleaned(＞100 times)without loss of adhesion.The AgCF encapsulated inside silicone elastomers was overlapped to construct a dynamic network under repeated stretching(10％strain)and bending(90°)deformations,enabling small intrinsic impedance(0.3 Ω,0.1 Hz)and contact impedance variation(0.7 kΩ)in high-frequency vibration(70 Hz).All hard/soft modules of the multilead ECG system were integrated into lightweight clothing and equipped with wireless transmission for signal visualization.By synchronous acquisition of Ⅰ-Ⅲ,aVR,aVL,aVF,and V4 lead data,the multilead ECG sensing system was suitable for various scenarios,such as exercise,rest,and sleep,with extremely high signal-to-noise ratios.