Abstract:〔Abstract〕 Objective To observe the therapeutic effect of complete transposition of great arteries (TGA) combined with unrestricted ventricular septal defect (VSD) or Taussig-Bing anomaly (TBA) in over-age children undergoing arterial switch operation (ASO), and analyze its influencing factors. Methods The data of 60 over-age children with TGA combined with unrestricted VSD or TBA, aged > 6 months, admitted to the Children's Hospital Affiliated to Zhengzhou University from January 2015 to January 2021 were reviewed. All children were treated with ASO, and were divided into death group and survival group according to their mortality within 1 year after surgery. Baseline data, perioperative indexes and curative effect were compared between the two groups, and factors influencing curative effect were analyzed by logistic regression. Results 7 cases died after surgery, the mortality rate within 1 year after surgery was 11.67 %, including 6 cases died in hospital (10.00 %) and 1 case died during follow-up (1.67 %). The postoperative mechanical ventilation time, ICU time and total hospital stay in the death group were significantly longer than those in the survival group, and the postoperative complication rate was significantly higher than that in the survival group, the differences were statistically significant (P < 0.05). Postoperative mean pulmonary arterial pressure (MPAP) and pulmonary blood pressure/systemic blood pressure (P/S PR) were significantly lower than the preoperative levels of the two groups, and arterial oxygen saturation (SpO2) was significantly higher than the preoperative level in the two groups. Preoperative SpO2 in the death group was significantly lower than that in the survival group, and postoperative MPAP, P/S PR before and after surgery were significantly higher than those in the survival group, the differences were statistically significant (P < 0.05). Multivariate logistic regression analysis showed that preoperative SpO2 was an independent protective factor for poor surgical outcomes in over-age children with TGA combined with non-restrictive VSD or TBA, while postoperative MPAP, preoperative and postoperative P/S PR were independent risk factors. Conclusion ASO can effectively improve hypoxia, circulatory function and cardiac function in over-aged children with TGA combined with non-restrictive VSD or TBA, while preoperative SpO2, postoperative MPAP, preoperative and postoperative P/S PR are independent influencing factors for poor therapeutic effect.