Abstract: In the detection of low altitude flight target in the sea surface, the acoustic DOA estimation is used to guide other high-precision radar systems, and the real-time performance of the acoustic DOA estimation is demanded. Aiming at the fast DOA estimation problem of low altitude and high subsonic flight target, the background was the fast acoustic direction-finding of high subsonic flight target by the several microphones in the finite space of the sea surface. The time-domain received signal model was established based on the uniform linear cross sensor arrays. To realize the fast DOA estimation of the high subsonic flight target, the traditional broadband MSWF of DOA estimation was expanded to the time signals, and the related DOA estimation method was proposed. The proposed method maintains the advantages of the MUSIC methods and effectively improves the real-time performance in the action.