【Abstract】Objective To explore the influencing factors for gastrointestinal intolerance after enteral nutrition (EN) treatment in elderly patients with acute cerebral infarction (ACI), and analyze the correlation between the intolerance and quality of life (QoL). Methods A retrospective study was conducted on 160 elderly ACI patients undergoing EN support therapy in our hospital from January 2021 to December 2023. After EN treatment, they were assigned into an observation group (with gastrointestinal intolerance, n=69) and a control group (gastrointestinal tolerance, n=91). The general clinical data and QoL status were recorded in the two groups. SPSS statistics 22.0 was used for data analysis. Depending on data type, t test orχ2 test was employed to compare the data between the groups, and multivariate logistic regression analysis was utilized to identify the related factors affecting gastrointestinal intolerance after EN treatment in the ACI elderly patients. Spearman rank correlation analysis was applied to analyze the correlation between gastrointestinal intolerance and QoL in the patients. Results There were significant differences between the two groups before EN treatment in terms of 2-hour postprandial plasma glucose (2hPG), serum albumin, use of sedative drugs and vasoactive drugs, intra-abdominal pressure (IAP), central venous pressure (CVP), start time of EN, neurological dysfunction, emotional stress, and secondary infection after cerebral infarction (P<0.05). After treatment, the observation group had obviously higher scores of material living state, psychological function, physical function, and social function than the control group (P<0.05). Multivariate logistic regression analysis showed that 2hPG ≥11.1 mmol/L (OR=6.253,95%CI 1.604-24.367), serum albumin <35 g/L (OR=4.679,95%CI 1.189-18.413), IAP ≥15 mmHg (OR=3.823,95%CI 1.207-12.103), CVP ≥12 cmH2O (OR=4.683,95%CI 1.209-18.144), start time of EN ≥3 d (OR=3.939,95%CI 1.164-13.331), neurological dysfunction (OR=5.468,95%CI 1.331-22.470), emotional stress (OR=3.995,95%CI 1.180-13.519), and secondary infection after cerebral infarction (OR=4.100,95%CI 1.209-13.903) were independent risk factors for gastrointestinal intolerance in elderly ACI patients after EN treatment (P<0.05). Spearman rank correlation analysis found that gastrointestinal intolerance was negatively correlated with material living state, psychological function, physical function, and social function in the patients (rs=-0.734, -0.664, -0.484, -0.628; P<0.05). Conclusion 2hPG ≥11.1 mmol/L, serum albumin <35 g/L, IAP ≥15 mmHg, CVP ≥12 cmH2O, start time of EN ≥3 d, neurological dysfunction, emotional stress, and secondary infection after cerebral infarction are independent risk factors for gastrointestinal intolerance after EN treatment in elderly ACI patients. Clinically, management of the above-mentioned factors needs to be strengthened to lay a foundation for nutritional support and improvement of the QoL in the patients.