Multi-baseline interferometer （MBI） receiver is a kind of important sensor for electronic reconnaissance， which is widely used in radio direction finding （RDF） with the advantages of high accuracy of angle measurement and fast processing speed. A jamming strategy of multiple overlapping signals is proposed according to the working principle of the interferometer direction finding， and the jamming mechanism of multiple signals on interferometer direction finding is studied. Modeling and simulation are carried out to evaluate the jamming strategy. The simulation results show that the multiple overlapping signals can significantly jam the interferometer direction finding and make the interferometer fail to obtain the true direction of the radio frequency （RF） target and output the wrong indication of simultaneous arrival signals at the same time.