The present disclosure relates to a vital sign extraction method and system. The system comprises a receiving module for receiving at least one type of physiological information； a feature extraction module configured to extract a first feature and a second feature of the physiological information by using a first technique and a second technique； a processing module for performing a matching calculation on the first feature and the second feature, marking matching results, and identifying a noise result of the physiological information based on the matching results； and a calculation module for calculating a physiological sign of a living body.
