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Objective To investigate nutritional treatment in the intensive care unit (ICU) of the mainland China. Methods A cross-sectional study was conducted in 116 ICUs of 118 mainland hospitals on April 26th, 2017. All patients of these ICUs were investigated at 0 o'clock on April 26th. Demographic and clinical parameters of those patients on April 25th (the investigation day) were recorded, including the dates of hospitalization, ICU admission and nutrition initiation and clinical outcome on 28 days after the investigation day. Results A total of 1953 patients were collected, including 631 females and 1306 males. The mean age was (64.1±19.3) years old (1950 cases). The means of Glasgow Coma Scale (GCS), Sequential Organ Failure Assessment (SOFA) and Acute Physiology and Chronic Health Evaluation Ⅱ (APACHEⅡ) scores were (10.76±4.35)(1749 cases), (5.65±3.52)(1783 cases), (17.14±7.31)(1792 cases), respectively. The outcomes of 28 days after the investigation day were 1483 survivors (75.9%), 312 non-survivors (16.0%) and 158 cases (8.1%) being lost to follow-up. There were no significant differences between the males and the females in age, severity of disease and clinical outcomes of 28 days but in height and weight. There were 73.7%(1440 cases) of patients with normal or mildly injured gastrointestinal function, 10.8%(210 cases) with moderately or severely injured function, 1.7%(33 cases) with gastrointestinal failure and 13.2%(258 cases) without evaluation. To the investigation day, enteral nutrition (EN) had been initiated in 69.4%(1356 cases) of patients and parenteral nutrition (PN) in 36.4%(711 cases) of patients. There were 1720(88.1%) patients with EN administration on the investigation day. The proportion of patients with nausea, vomit/regurgitation, aspiration, abdominal pain, abdominal distention and diarrhea was 4.8%(93 cases), 5.4%(105 cases), 0.9%(17 cases), 8.7%(170 cases), 27.5%(538 cases) and 4.3%(84 cases) respectively, while that of patients using EN was 3.1%(40 cases), 4.25%(54 cases), 0.79%(10 cases), 4.41%(56 cases), 26.85%(341 cases) and 5.43%(69 cases) correspondingly. The proportion of cases starting EN within 24, 48 and 72 hours after ICU entry was 22.4%(437/1953), 38.6%(754/1953) and 46.6%(911/1953), respectively. The proportion of cases receiving ≥80% estimated energy target (=past body weight ×25 kcal/kg.d) within 3, 7 and 14 days after ICU entry was 12.9%(78/607), 18.7%(189/1010) and 23%(305/1325) respectively, while that of cases with EN was 9.9%(60/607), 15.0%(151/1010) and 18.6%(246/1325) correspondingly. Conclusions Nowadays, most of patients in the mainland ICUs receive nutrition therapy and the EN usage rate is much higher than the PN rate. However, the time of EN initiation and the target-reaching rate of energy are suboptimal and an individualized plan of nutrition therapy is still missing. Details of energy delivery still need to be improved. DOI: 10.11855/j.issn.0577-7402.2019.05.05