Abstract: Fixed source field sounding, an artificial source transient ( time- domain )electromagnetic sounding method, has been applied to field test in southern margin of Junggar basin with complex relief and geologic structure. This tested profile shows the clear features of faults, strata and structures, thrust nappe. in it, including the intensively deformed zone, imbricate thrust zone, reversal thrust zone, front syncline zone and local structures. These suggest the fixed source field sounding can be well used to piedmont prospecting with complex relief and geological structures.

Key words: Junggar basin, electromagnetic survey, relief, structure, field test