The present invention discloses a method and apparatus for adjusting the dynamic scope of a signal. The method comprises respectively calculating the module values of channel estimation values of data subcarriers in the signal; calculating the mean value of the module values; determining displacements according to the module values and the mean value; and displacing the subcarriers by using the displacements, thus adjusting the dynamic scope of the signal. According to the invention, the data precision and the system decoding performance are improved.