Surgery Simulation System can be used to train surgeon to adapt for new operational methods,and also it can be used to preview the process of operation so as to discover some unpredicted problem. As one kind of specialized VR system,Surgery Simulation System aimed at simulating all the possible interactions during a real operation,which include cutting and suturing. This paper presents a soft tissue cutting algorithm. The algorithm processes Element model which composed of tetrahedrons,and can be employed ...