Abstract: The parametic array sub-bottom profile data based on continue wave is processed by pre-processing and interpretation processing for different interpretation purposes. The pre-processing includes data connection, delay correction, spherical spreading compensation, channel energy balance and large-scale power suppression. The interpretation processing includes bandpass filtering of instantaneous amplitude data and linear frequency extraction. The low frequency component of the instantaneous amplitude data after bandpass filtering is prominent, so it is suitable for structural interpretation. Furthermore, the linear frequency extraction data containing low frequency and high frequency components is beneficial to the sand body description.