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To assess the efficacy and safety of abdominal aortic (AA) balloon occlusion versus internal iliac arteries (IIA) balloon occlusion in patients with placenta accreta spectrum (PAS) disorders. Databases of Embase, PubMed, Web of Science and Cochrane Library were systematically searched from inception to May 2020. The relevant literature was screened and the quality was assessed. RevMan software 5.3 was used to analyze the data. Six studies involving 239 patients in AA occlusion and 281 patients in IIA occlusion were included. The results demonstrated that th