To reconstruct three-dimensional medical images in Internet based on Web and to achieve highly realistic display, getting two-dimensional image of human organs from ultrafast CT as sources, applying the volume rendering techniques to rebuild and display three-dimensional images in Java Applet and Java Application program. This reconstruction can be run in Web browser on many different kinds of computers.The anatomic structure of human organs can be displayed clearly in reconstructed three-dimensional images, espcially the gross morphology of the heart and the trail of the coronary artery. Three-Dimensional medical image reconstruction in Web browser implemented by Jave Applet is feasible, which will prompt clinical use of three-dimensional images. The solid conformation of human organs, especially the anatomic structure of the coronary artery, can be displayed by using three-dimensional reconstruction techniques, which may offer great references to clinic.