Abstract: Flow noise in the interior fluid of a vector hydrophone towed linear array is analyzed. Follow-ing Corcos′s model which describes the cross spectrum of the turbulent boundary layer pressure fluctuations,a method in the frequency-wave number field spectrum is applied to analyze the influence of flow noise. General mathematic forms of acoustic pressure and particle velocity in the flow noise field are given with regard to the excitation of the cable jacket. Furthermore,power spectrum of flow noise is calculated for point hydrophone,finite hydrophone and hydrophone array. Numerical results show that performance of the vector hydrophone towed linear array is very sensitive to the axial component of flow noise,and it will degrade to the conventional array in a flow noise controlled background.