In order to understand the cardiac electrophysiological mechanism more deeply as well as analyze and present complex electrophysiological activities of the heart, in this work we constructed a blending model to reveal the biophysical features of the heart. This model combined the mathematical physiological model of cardiac myocytes with the true cardiac tissue by the proposed energy blending absorption coefficient, which maps the tissue and electrophysiological attribute to the different optic property. The physiological activities of the heart in the three dimensional space are thus presented. The experimental results show that based on the blending model, the whole electrical conduction process in three-dimensional space within the inhomogeneous tissue at different time and the location where the activity starts and ends are clearly explored. Cardiac researchers are thus able to understand and deeply recognize the function mechanism of human cardiac bioelectricity physical system in a visual way, which helps to further speculate on the physiological and pathological responses of the heart.