The modulation transfer function (MTF) is one of the key indicators characterizing the signal transfer characteristics of an imaging system as a function of spatial frequency in terms of linear response theory. Various methods have been proposed to determine the MTF of an imaging system which is based on point, slit or edge images. The slanted-edge method to calculate the MTF is used. The method is modified to correct the bias caused by sensor and calculation procedure. The designed MTF, measured MTF, and calculated MTF have all been utilized to restore the remote sensing images by MTF compensation. All of the improved images are compared and the result verifies the effectiveness and reliabilities of the calculated MTF in the restoration of the degraded images.