A ventilation system and a synchronous respiratory monitoring method and device, comprising: an airflow supply device (1) for generating a ventilating airflow； a breathing conduit (2)； a patient interface (3) which is in communication with the airflow supply device (1) by means of the breathing conduit (2) so as to deliver the ventilation airflow to the airway of a patient； a ventilation detection device (4) which is provided on the breathing conduit (2) or the patient interface (3) and is used for detecting ventilation parameters； a patient detection device (5) for detecting respiratory trigger information of the patient； a data processing device (6) used for acquiring the ventilation parameters and respiratory trigger information and calculating human-machine synchronization status information accordingly； and a human-machine interaction device (7), comprising a display device so as to display the human-machine synchronization status information outputted by the data processing device (6). The human-machine synchronization status information is used to express the degree to which human and machine are out of sync. By visually displaying the human-machine synchronization status information, medical staff may determine whether ventilation settings are reasonable, evaluate the condition of a patient, and then select appropriate intervention measures so as to reduce or eliminate human-machine antagonism and make the patient comfortable.Système de ventilation et procédé et dispositif de surveillance respiratoire synchrone, comprenant : un dispositif d'alimentation en flux d'air (1) pour la génération d'un flux d'air de ventilation ； un conduit respiratoire (2) ； une interface patient (3) qui est en communication avec le dispositif d'alimentation en flux d'air (1) par l'intermédiaire du conduit respiratoire (2) de façon à amener le flux d'air de ventilation jusqu'aux voies respiratoires d'un patient ； un dispositif de détection concernant la ventilation (4) qui est disp
