Abstract： OBJECTIVE To understand the nutritional status and nutritional treatment of patients with different characteristics of malignant tumors,and analyze the existing problems,in order to provide a better basis for nutritional treatment of patients with ma-lignant tumors.METHODS 196 malignant tumor patients admitted to Zibo Central Hospital from September 2019 to August 2020 were randomly selected for nutritional assessment using PG-SGA.The nutritional biochemical indicators such as albumin,prealbu-min,and hemoglobin were collected from the closest time to the assessment,as well as the nutritional treatment during this hospitalization.The nutritional status and nutritional treatment status of the patients were analyzed.RESULTS The incidence of nu-tritional risk,malnutrition and moderate and severe malnutrition was 42.9%,79.6%and 49.5%in 196 tumor patients.Among the pa-tients aged≥65 years,the proportion of moderate and severe malnutrition was 58.9%,which was higher than that of the patients aged＜65 years(40.6%),and the difference was statistically significant(χ2=6.597,P＜0.05).In patients with digestive system tu-mors and upper digestive tract tumors,the proportion of moderate and severe malnutrition was 59.5%and 70.0%,respectively,high-er than that of patients with non-digestive system tumors(42.7%)and patients with lower digestive tract tumors(41.4%),with statisti-cal significance(χ2=5.298,6.239.P＜0.05).The body mass index,albumin,prealbumin,hemoglobin and other nutrition-related in-dexes of moderate to severe dystrophy patients with PG-SGA≥4 points were lower than those with PG-SGA＜4 points,and the differences were statistically significant(t=5.483,3.961,5.395,3.227,P＜0.05).The proportion of patients with moderate and severe malnutrition receiving nutrition treatment was 66.0%(64/97),mainly parenteral nutrition treatment,accounting for 92.2%(59/64),and parenteral nutrition treatment was mainly single bottle infusion of fat milk and/or amino acids,accounting for 74.6%(44/59).CONCLUSION The incidence of malnutrition in hospitalized patients with malignant tumors is higher,and the proportion of mal-nutrition in patients with digestive system tumors and elderly tumors is higher.Special attention should be paid to the normalization of nutritional treatment in patients with malnourished tumors.