At present

electrodes are always pasted on skin surface in ECG measurement

which causes inconvenience for long-time ECG monitoring.The principle of coupling capacity is applied to design a kind of non-contacted ECG measurement method

which detects ECG of human body by combining electrodes and the measured parts of skin to form coupled capacitance so as to measure ECG of human body

thus pasting electrodes is needless.Due to ECG signal collected by this method is susceptible to interference

a kind of adaptive principal component analysis（PCA） denoising algorithm is used in the subsequent ECG signal processing.Experiments show that this kind of non-contact measurement system can realize long-time ECG motoring without affecting people’s normal activities.