For the DOA estimation of uniform linear arrays under narrowband signal model,an efficient and fast direction-finding method based on spatial spectrum estimation is proposed.The principle of DOA estimation is presented,the relationship between spatial sampling rate and the unambiguous DOA estimation range is studied,and the factors affecting DOA estimation accuracy are analyzed.Based on this method,a simulation of DOA estimation under a specific uniform array model is given.The results show that high DOA estimation accuracy can be achieved by using this method.