1. Adult’s upper body made from special material, and the internal anatomical structure is distinct.
2. Transparent cyclic system: cephalic vein, basilic vein, jugular vein, subclavian vein, precava and heart; the whole process of the catheter entering precava can be seen.
3. Demonstration and practice of central and peripheral venipuncture can be done.
4. Osseous landmarks are distinct, which is good for practice in measuring the length of the intubated catheter.