Abstract: This paper used the emission factor method to estimate the emissions of greenhouse gases CO,CO₂ and CH₄ and carbon emissions caused by straw burning,and allocated carbon emissions in a grid based on fire point data.The results showed that the total amount of open-air straw burning in Guangxi in 2022 was 5.5045 million tons,and the emissions of CO,CO₂,and CH₄ were 0.3146 million tons,7.227 million tons,and 0.0144 million tons respectively.The total carbon emission was 2.1187 million tons.Among them,the most impact came from sugarcane straw with a contribution of 55.8%.The distribution of air pollutants emitted by biomass combustion sources was uneven.The high value areas of CO,CO₂ and CH₄ pollutant emissions and total carbon emissions were mainly concentrated in Laibin and Nanning,as well as Chongzuo in southwest Guangxi.The carbon emissions from open-air straw burning in Chongzuo City accounted for 19.5% of Guangxi's,17.2% for Laibin,and 15.9% for Nanning.The carbon emissions of other cities were all below 10%.Affected by the seasonality of crop farming and harvesting,the open-air straw burning in Guangxi changed seasonally,mainly from January to April and November to December.The sugarcane crushing season was a period of high incidence of open-air straw burning.