The 0~20 cm surface soil, the horizontal profile soil and the 0~200 cm vertical profile soil samples were collected systematically to determine the content of soil fluoride and related indicators, and the distribution characteristics and influencing factors of soil fluorine content in surface soil and profile soil were studied. The results show that the fluorine content in the surface soil of the study area ranges from 448×10 -6 to 1 009×10 -6, with the average content being 685×10 -6. The distribution characteristics of fluorine content in surface soil are obviously restricted by geological and geomorphological conditions. The soil with high fluoride background (>730×10 -6) is concentrated in the sub-clay of Qhb group, and the landform is flood plain.The surface soil fluorine is positively correlated with TFe2O3 (r=0.76), Mn (r=0.79), CaO (r=0.66) and Al2O3 (r=0.59), and negatively correlated with w(SiO2)/w(Al2O3).In the vertical section, soil fluorine is mainly concentrated in 0~155 cm. Iron and manganese oxides are important factors that restrict the vertical distribution of soil fluorine.
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