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In this paper, the singular value decomposition (SVD) method as a filter is applied before the tomographic inversion of soft-X-ray emission. Series of `filtered' signals including specific chronos and topos are obtained. (Here, chronos and topos are the decomposed spatial vectors and the decomposed temporal vectors, respectively). Given specific magnetic ux function with coupling m = 1 and m = 2 modes, the line-integrated soft-X-ray signals at all chords have been obtained . Then m = 1 and m = 2 modes have been identified by tomography of simulated `filtered' signals extracted by the SVD method. Finaly, using the experimental line-integrated soft-X-ray signals, m = 2 competent mode of complex magnetohydrodynamics( MHD) activities during internal soft disruption is observed. This result demonstrates that m = 2 mode plays an important role in internal disruption (Here, m is the poloidal mode number). [ABSTRACT FROM AUTHOR]