This invention provides a system for eliminating echo of stereos based on the separation of phone signals including an echo eliminator, a microphone and a loudspeaker, in which, said eliminator includes a periodic power detection module, a pulse response difference measurement module, a phone signal separation module, an intercommunication test module, an echo path estimation module and an adder. A method includes: estimating or renovating difference of near end room pulse response and echo path pulse response to separate single-path echo from multi-path echo when there is no intercommunication, getting the estimation of the echo path pulse response to further get the estimation of the separated single-path echo combining the source signal from a far end room, the single-path echo left from the separation of the received signal of a near end room microphone subtracts the corresponding estimation value so as to eliminate echos. |