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Background Due to long treatment cycle and medication dependence, patients with chronic heart failure (CHF) face many risks of out-of-hospital medication. Team Strategies and Tools to Enhance Performance and Patient Safety (TeamSTEPPS) is an evidence-based patient safety tool, which has been studied rarely in the management of out-of-hospital medication safety in CHF patients. Objective To discuss the role of TeamSTEPPS in the out-of-hospital medication safety management in CHF patients. Methods A total of 134 CHF patients hospitalized in the First Affiliated Hospital of Chongqing Medical University from June 2019 to June 2020 were selected, and were divided into the intervention group (n=62) and control group (n=61) according to the number of ward, receiving routine medication safety management, and TeamSTEPPS-based medication safety management, respectively. The medication error was evaluated before discharge and 6 months after discharge by the Medication Error Questionnaire developed by us. The medication knowledge, attitude and practice (KAP) were evaluated before discharge, 1, 3 and 6 months after discharge by a self-developed Medication KAP Scale. Cardiac function, dyspnea and edema were evaluated before discharge, 3 and 6 months after discharge. The readmission and all-cause mortality were collected 3 and 6 months after discharge. The safety attitude of medical workers was measured before intervention and 6 months after intervention by the Chinese version of the Safety Attitudes Questionnaire (SAQ-C) . Results The prevalence of ignoring the content of the prescription, omission error, wrong time error, wrong dose error, taking medication without a doctor's advice and unauthorized drug withdrawal differed between the two groups 6 months after discharge (P