Abstract: In offshore seismic survey, the waveform of a ghost looks same as the reflected wave. The ghost may heavily suppress the low-frequency components and result in the notching in frequency domain, and thus reducing the resolution of seismic records and resulting in the event aliasing or false events. In order to improve the quality of seismic data, we put forward in this paper a method as the following. As the depth of seismic receiver and water velocity are known, in the F-K domain, we eliminate the resource ghost in the receiver domain first, and then eliminate the receiver ghost in the shot-point domain. Afterwards, in the spectrum, the notching is restored and the frequency band is widened, which provides high quality seismic data for the subsequent seismic inversion.