<p>Bioimpedance technology is highly sensitive to blood flow. The feasibility of assessing cardiopulmonary interaction capacity using bioimpedance methods is explored in this paper. The interdependence between cardiac and pulmonary blood flow is evaluated by analyzing the time-frequency characteristics of cardiac and pulmonary impedance blood flow signals. A pulmonary vascular dilation model is established based on the Windkessel elastic chamber theory to analyze the mechanism of pulmonary vascular blood flow regulation. The measurement of cardiac and pulmonary impedance blood flow signals is synchronized and the phase shift characteristics between the signals are analyzed. The experimental findings reveal that under the intervention, the peak phase shift in the low-frequency exercise group decreases by 4.8% to 57%. The high-frequency exercise participants exhibit a phase shift variation rate of 68.4%, relative to the maximum phase shift observed in the low-frequency exercise group. This method utilizes bioimpedance technology for the synchronous study of cardiopulmonary blood flow signals, offering advantages such as non-invasiveness, simplicity of operation, and ease of promotion. This research provides scientific evidence for the assessment of cardiopulmonary regulation status using the bioimpedance method.</p>