Nutrition therapy plays a crucial role in the treatment of malignant tumors, which is beneficial to improve the immunity of cancer patients, improve the quality of life, reduce complications, and reduce treatment costs. In the past few decades, cancer nutrition therapy has developed rapidly and has attracted more and more attention in the international academic field. In 2020, a number of studies at home and abroad have conducted in⁃depth discussion on the nutritional therapy of cancer patients, evidence⁃based medicine continues to emerge and update, and important breakthroughs and advances have been made in the clinical diagnosis, evaluation, and treatment of cancer nutrition. Based on this, the Professional Committee of Cancer Nutrition, Chinese Anti⁃Cancer Association summarized the latest research progress and future development directions of cancer nutrition discipline in 2020 based on the current cancer nutrition research data and evidence.