Direction of arrival estimation is a technique of array signal processing,which is widely used in the radar and mobile communication systems to find the direction of the signal.Comparing with other methods,this method has high resolution in angular.Introducing this method into seismic data coherence algorithm,with the help of focusing in the frequency domain we can focus the phase on a given frequency.Polynomial fitting the focused amplitude and phase,we can obtain some attributes that reveal lateral amplitude and phase changes.These attributes have certain physical significance,and can be used to distinguish small faults and geologic features.Real data processing shows this method is effective.