Abstract: Based on the data of sounding andsurface observation from 2008 to 2017a at dari National Reference Station inthe Headwater Region of Yellow River,the characteristics and causes of the near-surfaceinversion layer in the Headwater Region of Yellow River are analyzed.The resultsshow that:(1)Thefrequency,thickness and intensity of inversion layer in theHeadwater Region of Yellow River vary with seasons.(2) The amount of cloud and the size of low-level wind speed are directly related to the generation and strength of inversion.Under the inversion layer, there are often accompanied by dew,frost,fogand other weather phenomena, there are obvious differences in the air humidity between the upper and lower parts of the inversion layer. (3) The inversion in the Headwater Region of Yellow River is the result of surfaceradiationunder the influence of climate background,geographical conditions and weatherconditions.