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Background: The aim of this systematic review was to evaluate the available evidence from randomized controlled trials (RCTs) of auricular acupressure (AA) therapy for preventing constipation in leukemia patients undergoing chemotherapy. Methods: We searched 5 English databases and 4 Chinese databases, from their inception until August 2017. Quantitative syntheses of RCTs were conducted using RevMan 5.3 software. Study selection, data extraction, and validation were performed independently by 2 reviewers. Cochrane criteria for risk-of-bias were used to assess the methodological quality of the trials. Results: Five RCTs met the inclusion criteria, and most were of low methodological quality. All RCTs compared AA + routine care with routine care alone. Our analysis found that complementary effects of AA can improve the scores of the Bristol Stool Form (BSF), the Constipation Assessment Scale (CAS), and the Patient Assessment of Constipation-Quality of Life (PAC-QOL). However, the same positive results were not found in terms of the Fatigue Severity Scale (FSS), the EuroQoL 5-domain (EQ-5D), and the Hospital Anxiety Depression Scale (HADS). Conclusions: Overall, as a potential safety therapy, AA may be recommended in addition to routine care including use of laxatives to prevent constipation in leukemia patients undergoing chemotherapy. In the future, more rigorous RCTs must be conducted to overcome the limitations of our existing data and to confirm the effect and safety of AA for managing constipation in leukemia patients undergoing chemotherapy.