Aiming at the problem of difficult detection and extraction of the line spectra in the shipradiated noise, the adaptive linespectrum enhancer based on the vector hydrophone is investigated in this paper. Taking the advantage of vector hydrophone which can synchronously measure the sound pressure and vibration velocity, the conventional adaptive linespectrum enhancer has been improved as the double input structure. Due to the relativity between the sound pressure signal and vibration velocity signal, the effect of linespectrum enhancement can be enhanced. The improved algorithm is validated by the measured data and the adaptive linespectrum enhancement algorithm is implemented based on the DSP Bulider platform in Simulink.