We present a DSPI based technique for measuring cardiac displacement. Body surface illuminated by a coherent laser will diffuse light and generate dynamic speckle field in the space. By using correlation fringe pattern produced from double exposure speckle patterns we can record temporal spatial displacement distribution in the cardiac cycle with double pulsed digital speckle pattern interferometry. Furthermore, it can also be possible to obtain reconstructed optical cardiogram with high accuracy throug the technique of automatic fringe analysis.