With the emission of a large number of greenhouse gases, global warming has become the focus of attention. In this paper, structural path analysis (SPA) and environmental extended input-output analysis (EEIOA) are used to study the carbon emission of various sectors in Guangdong Province. The proportion of carbon emission in different sectors is analyzed from different final demand, and the key carbon emission sectors and key carbon emission paths are determined. The results show that HEA sector (heavy industry sector) and ELE sector (electric power sector) are the key carbon emission sectors in Guangdong Province, accounting for 30.7% and 17.1% of total carbon emission, respectively. Export is the final demand for carbon emission in Guangdong, accounting for 66.7%. Most of the carbon emission paths of export are relatively short, tending to direct carbon emission, and most of the end points of the paths are HEA sector (heavy industry sector) and LIG sector (light industry sector). Most of the carbon emission paths of consumption mainly flow into consumption with SER sector (service sector) and ELE sector (electric power sector) as the end points. Most of the carbon emission paths of investment are more than two sectors, and most of the carbon emission of the paths flow into investment with CON sector (construction industry) as the end point, while CON sector (construction industry) causes carbon emission inflows from other sectors, so a large number of indirect carbon emission caused by investment.