Abstract: With the ultra-low emission transformation of coal-fired power plants,the emission concentration of filterable particulate matter（FPM） in flue gas has been effectively controlled,but the emission of condensable particulate matter（CPM） is often ignored.In order to solve this problem,EPA Method 202 A is adopted to sample the flue gas from the total outlet of three coal-fired units,and the emission characteristics of CPM and its water-soluble ions are also studied.The emission concentrations of FPM,CPM and water-soluble ionic component are obtained through sample analysis.The following conclusions are drawn:The mass emission concentration of CPM is12.2～32.71 mg/m~3,accounting for 74.80%～94.92% of the total particulate matter emitted;it is not fixed whether inorganic component or organic component is dominant in CPM;there are more NH₄⁺,Cl^-and SO₄^2- ions in CPM water-soluble ions,accounting for about82.35%～96.66% of all water-soluble ions.