The feasibility of making static effect correction in wavenumber domain is discussedin this paper. The paper aug-gotta using the cross-correlation matrix as the theoretical basis forchoosing filtering cutoff wavenumber, and conducts data-processiai; for three-dimensional numericalsimulation. The results demonstrate the practicability of eliminating static effect in the wavenu-mber domain. CSAMT data from a certain area of Yunnan Province were tenratively calculated,which yielded fairly satisfactory results.