Objective To evaluate the use of different nutrition evaluation methods to evaluate the nutritional status of elderly patients in hospital and analyze the related influencing factors, to provide a scitific basis by taking tnterventons improve the health of the elderly. Methods Selected 210 elderly patients in Beijing shijitan Hospital from April 2017 to April 2018 as the research objects. The nutritional status was evaluated by MNA-SF, BMI, CC, ALB levels, to analysis of the influence of related factors on the nutritional status of elderly patients. Results The rates of good nutrition were 40.48%, 42.86%, 78.57% and 79.52% respectively in MNA-SF, BMI, CC and ALB levels. In terms of MNA-SF score, CC, and ALB, there was a significant difference in the age group≥85、6574 years old and 75-84 years old in the elderly patients with statistical significance (P<0.05); Self-nutritional attention: The attention group compared MNA-SF score and ALB in elderly patients with general concern group with statistical significance (P<0.05); In terms of MNA-SF score, BMI, CC, and ALB, there is a statistical significance between the group of concern and the group of inpatient elderly patients (P<0.05). Daily life activity ability: In MNA-SF score, BMI, CC, and ALB, basic or complete self-care is statistically significant compared with the need for help, obvious or complete dependence (P<0.05). Conclusions Malnutrition accounts for a high proportion of elderly inpatients, and the nutritional evaluation results are influenced by age, educational level, self-nutritional attention and ability of daily activities. Health education and physical exercise to improve the patient's attention to their own nutrition and daily activities self-care ability, can help elderly inpatients improve nutritional status.