在作物需水量研究、节水灌溉等农业科研与生产工作中,土壤含水量是必须掌握的重要参数。中子法测水以其测量不必采土样,不破坏土壤结构,无滞后现象而受到人们的重视,已广泛应用于农林、水利、气象、地质等方面。但目前国内外生产的深层式中子土壤水分仪,由于中子逸出问题而不能测0～30cm 的浅层。另外,在高水分测量时非线性 In crop research, water-saving irrigation and other agricultural research and production work, soil moisture is an important parameter that must be grasped. Neutron method for measuring water does not need to take soil samples, does not destroy the soil structure, no lag phenomenon and people’s attention, has been widely used in agriculture, forestry, water conservancy, meteorology, geology and so on. However, at present, the deep neutron production soil moisture meter at home and abroad can not measure the shallow layer of 0-30cm due to the problem of neutron escape. In addition, non-linearity in high moisture measurement