To the sorting problem of Multiple-Input and Multiple-Output (MIMO) radar signals,by using the idea of matched filtering in radar receiver,a cluster matched filtering-based sorting algorithm of radar countermeasure reconnaissance is proposed.Pulse signals intercepted by radar reconnaissance receiver constitute the pulse group to be tested,with the first pulse being used as the reference signal.Cluster matched filter operation is made to the reference signal and the pulse group to be tested.When the operation result exceeds the threshold,it is judged that the tested pulse signals are in the same channel as the reference signal;otherwise,they are not in the same channel.After removal of signals in the same channel,sortingcontinues to be performed again,until sorting of all tested pulse signals is completed.Experimental simulation shows that the proposed sorting algorithm has strong anti-noise capability and low sorting error rate,is less affected by inter-pulse jitter,requires less number of intercepted signals,and easy to be implemented in engineering.