Increasing greenhouse gas emissions has become an important factor affecting global warming.The spatial heterogeneity of CH₄ concentration and its relationship with local climate and social economy are important factors affecting the ecological policy formulation.Greenhouse gas emission reduction is a challenging and imperative task for Hainan Island,which is a pilot zone for the national ecological protection drive.Here,the trend and driving factors of CH₄ concentration in Hainan Island during 2020-2021 were analyzed through the Geographically Weighted Regression (GWR) model,which was established by using GHGSat CH₄ product,temperature,rainfall,GDP and population datasets,as well as Theil-Sen trend analysis and Mann-Kendall test.The results showed a slight decreasing trend of CH₄ concentration in Hainan Island from 2020 to 2021 with the mean value of 1 848.40×10^-9 mol／mol;as for its spatial distribution,no obvious variation in 52.95％ areas and a significant decrease in 46.42％ areas were observed in Hainan Island.In addition,the GWR can reveal the response of CH₄ concentration distribution to climate factors on pixel scale,specifically,the regression coefficients between CH₄ concentration and temperature ranged from -114.92 to 127.80,and those between CH₄ concentration and rainfall ranged from -297.40 to 399.91;the regression coefficients of CH₄ concentration with GDP and population were relatively high,ranged at -4 125.55-4 509.07 and -1 751.43-1 556.41,respectively,suggesting possible big impacts of GDP and population on CH₄ concentration distribution.The R² of Ordinary Least Squares (OLS) and GWR for CH₄ concentration with temperature,rainfall,GDP and population were 0.14 and 0.83 respectively,indicating that GWR model outperformed the OLS model in explaining the spatial pattern of CH₄ concentration.This study revealed the trend and driving factors of CH₄ concentration in Hainan Island,thus provides a method guidance for evaluation of the dynamic CH₄ concentration in Hainan.