Using shuttle imaging radar SIR-C data

the authors studied the distribution and formation of shallow layer ground-water in China-Mongolia boundary. The following results are obtained: 1. The bright yellow belt on the composite SIR-C imagery （R: L-HH

G:L-HV

B:C-HV）shows the distribution of shallow groundwater

as a result of radar volume scatter and backscatter caused by shallow groundwater level

and well-growing vegetation and sand solidification along sand-dune. 2. Landform varies from gentle to steep in China-Mongolia boundary of the research area

it is caused by normal fault. The Up-block in China relatively fall. This forms a favorable condition for water storage. 3. Radar remote sensing has the capability of penetrating dry sand and soil

and captures surface and subsurface moisture information

and possesses the sensitivity of reflection roughness or micro-topography of ground surface and the crown layer of vegetation. It has a great advantage for remote sensing study in arid region. Radar remote sensing has been one of the useful means in prospecting for shallow layer underground water in arid area.