Underwater vehicle use sonar system to detect the enemy ship as well as its own position during its naviga-tion. The main sonar system which can be divided into active sonar and passive sonar is usually placed in the bow. However, noise is an important interference factor that both systems must overcome. In order to research flow-induced noise in the bow, the LES model was applied to simulate flow field out of the underwater vehicle to get fluctuating pressure. Then the fluctuating pressure was import into ACTRAN- a software based on Lighthill's acoustic analogy theory- to simulate the sound field in the bow. Speed, position of the array and shape of the array carrier were studied to reveal their influences on the propagation of flow-induced noise. The results show thatthe higher speed, the bigger of flow-induced noise. Furthermore, flow-induced noise can be diminished by increasing the distance between sonar array and dome and using relative smooth in-stallion surface.