The present invention provides a method and a system for capturing a segment of the least electrode contact noise from an electrocardiogram (ECG) signal. The method comprises: A: capturing an ECG signal； B: filtering the ECG signal； C: nonlinearly converting the filtered ECG signal； D: dividing the filtered ECG signal into a plurality of vectors in the form of a plurality of data points； E: computing, by a first threshold, a first endpoint of a signal segment that is not interfered by the electrode contact noise； F: computing, by a second threshold, a second endpoint of the signal segment that is not interfered by the electrode contact noise according to the first endpoint； G: positioning the signal segment that is not interfered by the electrode contact noise. The system comprises: a capturing device, a filtering device, a processing device and a positioning device.本發明揭露一種從心電圖訊號中擷取最低電極接觸雜訊之片段之方法與系統，該方法包括：A：擷取一心電圖訊號。B：將該心電圖訊號經過濾波處理。C：將該經濾波器處理之該心電圖訊號進行非線性轉換。D：將該經濾波處理之心電圖訊號以複數個資料點的形式分組為複數個向量。E：以一第一閥值求得未受電極接觸雜訊干擾的訊號片段之第一端點。F：以一第二閥值且根據該第一端點而求得未受電極接觸雜訊干擾的訊號片段之第二端點。G：定位出未受電極接觸雜訊干擾之訊號片段。而該系統包括：一擷取裝置、一濾波裝置、一處理裝置與一定位裝置。
