Abstract: The mass concentration of fine particulate matter（PM_2.5）was measured during haze days in winter in Wuhan Economic and Technological Development Zone （WEDZ）. Meanwhile，the four water-soluble anions and the inorganic elements in PM_2.5 were detected and analyzed with IC and XRF methods. The results showed that during the measuring period，the concentration of PM_2.5 in the targeted area ranged from 26. 00 to 321. 28 μg/m³. The average concentration was 158. 78 μg/m³，，which was much higher than the 24 h mean value（75 μg/m³）in Nation Ambient Air Quality Standard issued by Ministry of Environmental Protection of the People′s Republic of China. In fine particulate matter，the concentration of the four anions followed the order of NO₃^- > SO₄^2- > F^- > Cl^-，they accounted for 36. 85% of PM_2.5. The 13 inorganic elements accounted for 25. 08% of PM_2.5. Therefore，water-soluble anions were major components of PM_2.5. The mean ratio of NO₃^- and SO₄^2- was 1. 22，and the correlation coefficient of the above anions was as high as 0. 957 1，which showed that there exists high homology between NO₃^- and SO₄^2-. This phenomenon also indicated that the main contribution of PM_2.5 in WEDZ was mobile source，rather than stationary source. Besides，the enrichment factors（EF）of Ti，Cr， Ni，Zn，As were all higher than 10，and the EF of Ni was even above 1 000. The correlation coefficients of Fe and Ni and of Fe and Cr were 0. 833 and 0. 846，respectively. The above results indicated that Ti，Cr，Zn，As and Ni mainly originated from the anthropogenic sources.

Key words: PM_2.5, ions chromatography（IC）, water-soluble anions, XRF