Spatio-temporal change characteristics and driving factors of methane (CH₄) concentration are important to the study of global climate change.Yet few reports have been found to reveal the variation characteristics of methane concentration on different time scales and the contribution of potential climate drivers in the tropics.In this study,based on GHGsat methane concentration products,the seasonal variation characteristics of methane concentration were analyzed by taking Hainan Island as a typical tropical study area.In addition,this study determined the sensitivity of temporal and spatial distribution of methane to climatic factors in Hainan Island,and also analyzed the contribution of climate factors and topographic factors to methane concentration by using Boosted Regression Trees (BRT).The results showed that methane concentration in Hainan Island had significant seasonal variations,which was a significant downward trend from April to August and a significant upward trend from September to December;spatially,the areas with high methane concentration were mainly clustered around coastline,while low methane concentration area was mainly distributed in the middle of Hainan Island.The results of the univariate linear regression model showed that there was a weak positive correlation between air temperature and methane concentration,and a weak negative correlation between rainfall and methane concentration.The results of BRT showed that the contribution of altitude,rainfall and air temperature to methane concentration distribution is 71.95％,20.52％ and 5.66％,respectively.This study can provide a scientific basis for the contribution of climatic factors to methane emissions.