Abstract: Based on comparative analysis of the monitoring data of PM_2.5 and PM₁₀ of three cities from Hainan province (Yongxing Island, Sanya and Haikou) from December of 2016 to May of 2017, the pollution characteristics in Yongxing Island were analyzed.The results show that, compared with Haikou and Sanya, Yongxing Island has the best air quality, the lightest fine particle pollution and the most stable daily variation of PM_2.5 and PM₁₀ mass concentrations.The main reason is that human production activities have little impact on air quality.Through further analysis of PM_2.5 mass concentrations of the three stations and near-surface meteorological elements (relative humidity, total monthly precipitation and visibility), it is found that the PM_2.5 mass concentration of Yongxing Island is negatively correlated with visibility as a whole, and the PM_2.5 mass concentration of Yongxing Island is the lowest at different wind speeds and winds, followed by Sanya and Haikou.The large PM_2.5 concentration area of Yongxing Island mainly appears in the upward direction of the northeast wind, while the air flow in the other directions is relatively clean.Moreover, the initial PM_2.5 mass concentration of Yongxing Island is relatively low under the conditions of calm wind or light wind.By analyzing the 72-hour backward trajectory six hours a day, it is found that during the winter and summer monsoon, Yongxing Island is respectively affected by the Marine air currents originating from the western Pacific Ocean and the South China Sea, which are directly related to the air quality of Yongxing Island.