The invention relates to a method of intelligent blood oxygen monitoring, a system and a method for evaluating cardiopulmonary function based on the state of blood oxygen. A hemoglobin parameter in a brain tissue to be monitored is obtained first, and the hemoglobin parameter can be obtained through non-invasive optical testing, and one or combination of the following monitoring parameters is calculated based on the hemoglobin parameter: monitoring parameter I: the duration of the hemoglobin parameter from incremental movement to peak Monitoring parameter II: the amount of change between the initial value and peak of the hemoglobin parameter, monitoring parameter III: The average change rate of the hemoglobin parameter from the beginning of the incremental movement to the peak, and the monitoring parameter IV: the average change rate of the hemoglobin parameter from 60% of the whole incremental movement to the peak. Bring the above monitoring parameters into the linear prediction system or nonlinear prediction system, evaluate the blood oxygen status of the monitor edges and oxygen according to a default threshold, and further evaluate the cardiopulmonary function of the monitored person according to the blood oxygen state
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