Computerized Tomography needs projected images from all directions

while tomosynthesis doesn′t need the information from all directions

but its reconstruction image is indistinct.Frequency Domain Deconvolution Imaging（FDDI） overcomes this shortcoming

but FDDI′s calculation is large

and its zero frequency will be lost.In this paper

we solve convolution equation based on Vandermonde Matrix and the method of image displacement elimination in space domain that we propose

so that we can reconstruct sectional image quickly.We use computer simulation and obtain clear sectional image.