Intensive care unit of Peking University Third Hospital (PUTH) has treated several patients with severe malnutrition successfully since 2008. Most of these patients had a BMI ＜ 10 (kg/m2) at admission. After admission, a multidisciplinary team, consisting of specialists in the field of intensive care, pharmacy, psychology, and physical therapy assessed all patients. Most of the treatment has been regarded successful with a significant BMI gain and little in-hospital mortality. Based on long-term clinical experience, as well as on evidence-based literature, PUTH nutrition group developed a guideline version 1.0 for the treatment of severe malnutrition in August, 2015.