Patients in the intensive care unit (ICU) are often at risk of gastrointestinal dysfunction and malnutrition. Gastrointestinal dysfunction was associated with poor clinical outcomes, including prolonged mechanical ventilation, prolonged ICU stay and increased 90-day mortality. There have been some clinical studies investigating the effects of traditional Chinese acupoint massage, acupuncture, or moxibustion of 7 acupoints (Zhongwan Point (CV12), Tianshu Point (ST25), Qihai Point (CV6), Zusanli point (ST36), Shangjuxu Point (ST37), Neiguan Point (PC6) and Hegu Point (LI4)) on gastrointestinal function recovery. Gastrointestinal dysfunction could be improved by stimulating single acupoint or combining multiple acupoints, and the effects of combined stimulation of multiple acupoints was better for the improvement of gastrointestinal dysfunction. This project aims to study the effects of traditional Chinese acupoint massage, acupuncture, or moxibustion of 7 acupoints (Zhongwan Point (CV12), Tianshu Point (ST25), Qihai Point (CV6), Zusanli point (ST36), Shangjuxu Point (ST37), Neiguan Point (PC6) and Hegu Point (LI4)) on the 28-day survival, and the gastrointestinal function recovery in critically ill patients with with gastrointestinal dysfunction caused by medical diseases and critically ill patients with high risk of malnutrition in ICU, and to observe their effects on the recovery of gastrointestinal barrier function by measuring the serum intestinal fatty acid binding protein (iFABP), citrulline, diamine oxidase (DAO) and D-lactic acid. Studies have shown that serum iFABP, citrulline, DAO and D-lactic acid could reflect the intestinal barrier function of the patients.