A kind of frequency spectrum analysis method with what quantifying interaction of cardiopulmonary circulation of system of the present invention, the assessment of cardiac function is carried out using monitoring signal relevant to heart, and it penetrates and captures the interior frequency domain signal of a fixed frequency band to carry out, can avoid frequency it is lower and will affect heart correlation monitoring signal accidental interference, there is no need to testee anaesthetizes sb. generally or makes to can be carried out the present invention, and then the evaluation index as testee's cardiac function under the calm state of place what. 本發明係一種用於量化心肺循環交互作用之頻譜分析方法，利用與心臟相關的監測訊號進行心臟功能的評估，並透過擷取一固定頻帶內之頻域訊號來進行，能避開頻率較低且會影響心臟相關監測訊號的偶發干擾，因此無需將受測者進行全身麻醉或使之處於鎮定狀態下即能進行本發明，進而作為受測者心臟功能的評估指標。
