In this presentation, an innovative technology on developing non-contact capacitive coupling-based sensor system of flexible hybrid electronics has been applied in biological signal measurement combined with electromyography (EMG) and smart armband. The technology of capacitive coupling-based sensor device with high sensitivity and high impedance of analog front-end design has been designed to overcome the weakness of traditional sensor such as interference of noise and uncomfortable feeling of electrode patch. For enhancing measurement accuracy of biological signals under isolated textile, the flexible capacitively coupled electrodes were designed with two sensing electrodes and a ground electrode for noise reduction. The algorithm were designed to compensate the impedance of EMG signals between human skin with textile material for improving the accuracy of EMG sensing circuits. The background noise is filtered out through the software calculation and the signal-to-noise ratio of EMG signal is improved to be 30 dB. Furthermore, Non-contact capacitive coupling-based sensor system of flexible hybrid electronics for wearable devices has been successful demonstrated with the biological signal detecting of EMG during exercise and the FHE system can also apply to the integration of sports training systems to improve the fusion of the virtual reality for interactive technology in the future.