The invention provides a method for acquiring 
end expiration intravascular 
pressure wave data through an expiratory 
apnea method. The method specifically comprises the following steps: for a patient with pure 
positive airway pressure, a 
breathing control device is started directly to enable a 
breathing machine to be in an expiratory 
apnea state, air supply of 
positive airway pressure is stopped, at the time, 
positive airway pressure is of an expiration phase, when the control device is stopped, the 
breathing machine supplies air normally, accordingly, variation is caused to vascular 
pressure wave, and the flat part before the variation is intravascular pressure 
end expiration point, so that the intravascular 
pressure wave of the expiration phase can be obtained; and for patient combining positive 
airway pressure with autonomous 
respiration, the 
breathing control device is enabled to be in a close state through being started at the end of autonomous inspiration, positive 
airway pressure is stopped to supply air, at the time, autonomous 
respiration of the patient and positive 
airway pressure of the breathing 
machine are both of an expiration phase, when the control device is stopped or autonomous 
respiration occurs, accordingly, variation is caused to vascular pressure wave, and the flat part before the variation is intravascular pressure 
end expiration point, so that end expiration intravascular pressure wave data can be obtained. The method is rapid and accurate in analysis, and the obtained intravascular pressure is closer to objective end expiration intravascular pressure. The method is high in clinical compliance and is particularly applicable to 
emergency department, 
anesthesia department, 
cardiology, department of 
cardiac surgery, ICU (
Intensive Care Unit) and other departments where patients are required to be saved quickly.