Abstract：The rapid development of Magnetotellurics(MT) made the processing of 3-D MT data become an importance day by day, 3-D interpolation is also an important link in latter 3-D processing and interpretation.The paper applied discrete Fourier transform to interpolation of 3-D MT data.First,processing the raw data into a column of periodic data;then,FT,interpolation and inverse FT of the data, resulted in interpolated data.The length of interpolated data is two times of that of raw data,3-D interpolation of data is carried out along x,y and depth direction.It is showed by analysis that 3-D interpolation fully used spatial information and has certain effects on information-enhancing and noise-elimination.The real application showed the method is prospective method.
