Since 2006, the Parenteral and Enteral Nutrition Branch of Chinese Medical Association has successively formulated and updated the "Clinical Diagnosis and Treatment Guidelines: Parenteral and Enteral Nutrition Branch"[1]"Chinese Pediatric Enteral and Parenteral Nutrition Support Clinical Application Guidelines"[2]Guidelines for Clinical Application of Neonatal Nutritional Support in China[3], "Chinese Expert Consensus on Parenteral and Enteral Nutrition Support for Elderly Patients"[4]etc., providing guiding opinions for clinical nutrition diagnosis and treatment. In order to guide the rational use of vitamin preparations in clinical nutrition, popularize the new concept of clinical nutrition support in the world, improve clinicians 'understanding of patients' vitamin metabolism assessment and strengthen their understanding of prevention and treatment of vitamin deficiency, and further promote the development of vitamin research in China, some experts from Parenteral and Enteral Nutrition Branch of Chinese Medical Association and Parenteral and Enteral Nutrition Branch of Beijing Medical Association have discussed and formulated this consensus. The content of the consensus needs to be improved, so please criticize and correct.