In order to study the composition of particulate matters produced by municipal solid waste incineration (MSWI) in Chongqing,particulate matters from two typical domestic waste incineration power plants in Chongqing were collected, and the chemical composition was analyzed. The results show that the mass fraction of OC, EC and SO2 -4 in PM10 and PM2.5 sources are high. The mass fractions of OC and EC are both more than 10%. The mass fraction of SO2-4 is between 3.22%~18.5%. The mass fractions of S,K,NH+4 and Ca2+ are all higher than 1%. The mass fraction of Cl- in PM2.5 source is as high as 3.92%~11.9%. The results of the study are not very different from the compositions of the PM2.5 source and PM10 source in the domestic waste incineration plants of other cities. The mass fractions of K, Cl-, SO2-4 and OC in PM10 source in Chongqing are 1.16%, 5.42%, 11.2%, and 30.3%, respectively, which are higher than those in other cities. The mass fractions of Cl-, SO2-4 and OC in PM2.5 source are 7.70%, 6.99%, and 29.0%, respectively, which are also higher than those in other cities.