CO₂ concentrationsretrieved by Greenhouse gases Observing SATellite(GOSAT) are used to study the spatial and temporal distribution of CO₂ in Jiangsu province.The good agreement between the GOSAT data and ground-based measurements in Waliguan and Shangdianzi stations,which is shown in comparative analysis,validates the GOSAT data for CO₂ concentrationsretrieval.The spatial-temporal characteristics of CO₂ concentration by GOSAT data are listed and analyzed for Jiangsu province during June 2009 to May 2011.The volume fraction of CO₂ are at the range of 398×10^-6-400×10^-6 and 393×10^-6-394×10^-6 at 975 hPa and 850 hPa,respectively.The volume fraction of CO₂ changes less in horizontal than in vertical direction.As for seasonal distribution,the maximum and minimum CO₂ concentrations are found in winter and summer,respectively,which can be related to photosynthesis variation in different seasons.As shown by the two years' data,the volume fraction of CO₂ increases by 3×10^-6-5×10^-6 in summer and autumn,and 2×10^-6-4×10^-6 in winter and spring.The diurnal variation of CO₂ concentrationshows peak at 02:00 and troughat 14:00 in Nanjing and Xuzhou station,which may be attributed to vegetation's photosynthesis variation at diurnal level.