Abstract: Objective To systematically evaluate the effect of long-term exposure to fine particulate air pollution on the incidence of hypertension in adults. Methods The cohort studies on the effects of long-term exposure to fine paticulate matter(PM_2.5) on hypertension published in China national knowledge infrastructure（CNKI）, Wanfang database, PubMed, Embase, Cochrane Library and other databases were searched（the literature retrieval was up to November 2020）. Hazard ratio（HR） and its 95%CI were extracted to assess the strength of the association. Subgroup analysis and sensitivity analysis were also performed. Results Seven studies were finally included in the analysis. The overall meta-analysis found that long-term exposure to PM2.5 increased the risk of hypertension, HR=1.11, 95%CI 1.05-1.17 for each 10 μg/m~3 increase in exposure concentration. Subgroup analysis showed that the elder（≥50 years old） and menopause people may be the high-risk group, and there was no significant difference in the risk of hypertension caused by long-term PM_2.5 exposure between Chinese and North American populations and different gender groups. Conclusion There is a positive correlation between long-term PM_2.5 exposure and the occurrence of hypertension.