Abstract: Based on the investigation and sampling data of the incoming waste of a domestic waste incineration plant in Suzhou from 2017 to 2021， various indicators such as the physical composition and moisture content of the waste were analyzed. And the impact of changes in physical and chemical characteristics on the carbon emissions of the incineration process was discussed. The results showed that the incoming waste in Suzhou was mainly composed of kitchen waste， rubber and plastic， and paper. After the implementation of the waste classification policy， the average content of kitchen waste（39.2%） decreased significantly compared with that before classification （54.8%）. While the content of rubber and plastic （37.4%） increased by 11.6 percents. The moisture content of waste have decreased year by year with the change of components， while the low calorific value was the opposite. Carbon emission accounting analysis was carried out using the clean development mechanism methodology combined with the improved upstream operation downstream table method. With the increase in rubber and plastic content and the decline in moisture content and other factors， the direct emissions generated by the waste incineration process increased year by year， while the carbon emission reduction potential declined. It was suggested that Suzhou should effectively sort and utilize rubber and plastic products with high utilization value in waste in the future on the basis of waste classification management. At the same time， some technical measures should be taken to control the carbon emissions generated in the process of waste incineration， so as to further enhance the carbon emission reduction potential of waste to energy projects.

Key words: garbage classification, incoming waste, physical and chemical properties, incineration, carbon emission