Abstract: The classical spatial spectrum estimation algorithm will not be able to estimate the direction-of-arrival (DOA) for weak signals in the presence of strong jamming. In order to solve the problem, a novel DOA estimation algorithm via subarray jamming suppression based on uniform circular array(UCA) has been proposed in this paper. Divide the whole array into several subarrays and then utilize the least square beamforming algorithm proposed in the paper on the subarrays respectively to suppress the strong jamming, each weighted subarray can be regarded as an ‘oriented array element’, we can use all the weighted subarrays to form a new virtual array and then estimate the DOA for weak signals through the virtual array via super resolution algorithms such as MUSIC. The proposed method can estimate the DOA for weak signals correctly by removing the effect of strong jamming via subarray beamforming and the probability of correct estimation for weak signals’ directions has been improved. Its effectiveness and correctness have been verified by computer simulations at last.