Respiratory waveform identification method and system

The invention discloses a respiratory waveform identification method. The method includes the steps of a, detecting a respiratory air flow in a respiratory cycle; b, measuring the amplitude of the respiratory air flow and the time of the respiratory cycle; c, by multiple sampling points, determining an inhaling waveform and an exhaling waveform according to the amplitude and the time; d, normalizing the amplitude and the time of one of the inhaling waveform and the exhaling waveform to build a normalized waveform; accumulating a difference value between a reference waveform and the normalized waveform so as to calculate a flow coefficient which determines that the normalized waveform can be identified as a normal respiration state and an abnormal respiration state. The method has the advantages that a curve (or a weighted curve or a standard waveform) is used to fit the inhaling waveform or the exhaling waveform so as to calculate the difference value, and the normal respiration state and the abnormal respiration state are identified by accumulating the difference value. The invention further provides a respiratory waveform identification system.