Objective To understand the status of nutritional care for the caregivers of cancer patients undergoing chemotherapy and explore its influencing factors,so as to provide evidence for the hospital to formulate scientific and effective nutritional care plan for cancer patients. Method A total of 322 caregivers of chemotherapy patients were recruited in the Second Affiliated Hospital of Air Force Military Medical University from June to July 2021 using a stratified sampling method.A self⁃designed nutritional care questionnaire verified by reliability and validity was used for field questionnaire survey. Result The scores of nutritional care knowledge,trust and practice were(5.61±2.36),(23.98±2.99),(17.08±4.90),and the pass rates were 13.88%,99.37% and 53.31%,respectively.The knowledge, trust and practice of nutritional care in urban caregivers were higher than those in rural areas(β=1.526、1.002、1.585，P<0.01);The knowledge, trust and practice of nutritional care of those with college degree or above were higher than others(β=0.971,0.870,1.280,P<0.05);The caregiver behavior of married caregivers was relatively poor(β=⁃1.585,P<0.05);Nursing knowledge derived from the nutritional care behavior of medical staff was better(β=2.462,P<0.001);Caregivers whose knowledge was derived from electronic media had care knowledge (β=0.736,P<0.05)and behavior(β=1.180,P<0.05)were all better. Conclusion The caregivers of cancer chemotherapy patients were seriously lacking in nutritional care knowledge.They have a positive attitude towards nutrition care but their behaviors need to be improved. Nutritional care knowledge, belief and practice status are affected by their family location, education level, marital status and sources of nursing knowledge. Clinically,nutrition care programs for cancer chemotherapy patients should be formulated in accordance with the different characteristics of caregivers.Caregivers rural areas,under high school education,and the married should be the focus of attention, and health education should be carried out by means of medical personnel and electronic media education as far as possible.