Abstract: Objective: To evaluate the effects of inhaled aromatherapy on anxiety among perioperative patients.Methods: We searched the following databases such as PubMed, Web of Science, Cochrane Library, CNKI, CBM, and WanFang Data electronically. The retrieval time was up to April 15, 2016 and other sources as applying were also retrieved.According to the evaluation method of Cochrane system, the quality evaluation and data extraction were carried out, and the RevMan 5.3 software was used for Meta analysis. Results: A total of 7 randomized controlled trials (RCTs) with 450 patients were recruited. Meta analysis of the score difference of the State Trait Anxiety Inventory (STAI) before and after the intervention showed that WMD was -5.39 with 95% CI (-9.34, -1.43), Z=2.67, and P=0.008, and the combined effect was statistically significant. Meta analysis of the Visual Analog Score (VAS) difference before and after the intervention showed that WMD was -1.03 with 95% CI (-1.20, -0.86), Z=11.86, and P<0.001, and the combined effect was statistically significant.The diffidence of the systolic blood pressure and diastolic blood pressure before and after the intervention were less than 0,while the difference of heart rate and respiratory rate before and after the intervention were not all less than 0. Conclusion:Inhaled aromatherapy can relieve anxiety and pain among perioperative patients. It could lower blood pressure or blood pressure climbing extent, but the effect is not obvious for heart rate and respiratory rate.