Aiming at problem that traditional independent component analysis（ ICA） algorithm can’t realize realtime separation and extraction of signal

an algorithm based on correlation evaluation and realtime Fast ICA is proposed. The algorithm divides mixed signal into signal segments and Fast ICA processing is carried out

and conducts correlation evaluation on signal segment. The separated signal segment which is most correlated to electrocardiogram（ ECG） signal is selected for phase modification and amplitude zoom to realize ECG signal realtime extraction. Baseline drift removing of mixed signal is carried out before separating processing

improve robustness of agorithm. Experimental results demonstrate that accuracy of the proposed algorithm can achieve 96.7%

can realize real-time extraction of ECG signal effectively.