【Objective】 To explore the effect of mobile transfusion closed-loop information system in the whole process management of clinical blood transfusion. 【Methods】 The hospital information system (HIS) of Soochow Hospital affiliated to Nanjing Medical University was integrated with the blood information system (BIS) and personal digital assistant (PDA) to build a closed-loop transfusion management process to ensure the safety of clinical blood use. From May 2021 to April 2022, 1 395 patients who were admitted to our hospital for blood transfusion therapy were studied. Among them, 632 patients from May to October 2021 (before the implementation of closed-loop management) were the control group, and 763 patients from November 2021 to April 2022 (after the implementation of closed-loop management) were the observation group. Before and after the implementation of closed-loop management, we compared the implementation rate of double-checking before blood sample collection, rate of transfusion within 30 min after blood issuing, implementation rate of double-checking of bedside transfusion, situation of patrol every 15 minutes, rate of transfusion completed within 4 h, rate of nursing documentation standardization, so as to evaluate the improvement effect of the whole process of transfusion management. 【Results】 The implementation rate of double-checking before blood sample collection was 99.48%(759/763) in the observation group and 93.99%(594/632) in the control group; the transfusion rate within 30 min after blood issuing was 95.02%(725/763) in the observation group and 91.46%(578/632) in the control group; the implementation rate of double-checking of bedside transfusion was 100%(763/763) in the observation group and 95.73%(605/632) in the control group; the complete rate of patrol every 15-min was 94.36%(720/763) in the observation group and 90.35%(571/632) in the control group; the completion rate of transfusion within 4 h was 95.81%(731/763) in the observation group and 92.25%(583/632) in the control group; the rate of nursing paperwork standardization was 98.03%(748/763) in the observation group and 81.80%(517/632) in the control group, and the difference between the two groups was statistically significant (P<0.05). 【Conclusion】 The mobile transfusion closed-loop information system can realize the whole process management of clinical blood transfusion, effectively improve the standardization of blood transfusion and transfusion documents, and guarantee the safety of clinical blood transfusion.