Abstract: Aiming at the problem that aerospace telemetry tracking and command (TT&C) radar is vulnerable to interference, on the basis of studying the interference identification method of aerospace TT&C channel, considering the high order and large amount of calculation of least mean square (LMS) algorithm, a fast adaptive interference cancellation algorithm is studied. The baseband signal is selected and deconstructed firstly, then the interference cancellation is realized based on the filter coefficients adaptively adjusted by LMS algorithm and the reconstructed interference signal. The simulation results show that compared with LMS algorithm, the proposed algorithm has small amount of calculation and fast operation speed. And the deterioration of signal-to-noise ratio of useful signal after cancellation can be controlled at about 0. 3 dB, which has certain engineering practicability.