Abstract: In order to make the telecommunication satellite operate well in the electromagnetic jamming and complex electromagnetic environment,a novel space-borne antenna multi-jamming direction finding and nulling method is presented.Firstly,a single-snapshot DOA estimation algorithm in frequency domain is gived to estimate the DOA of multiple targets,and then a nulling algorithm that keeps the shape of the main-lobe is implemented according to the above-estimated DOA compared with the conventional sidelobe cancelling algorithm.The algorithm solves the problems of both nulling depth and main-lobe shape keeping effect.Simulation results and performance analysis demonstrate that the algorithm is effective and feasible.