Abstract: The principal technical content of local geometric projection method is introduced,and a new correcting method by covering and a new measurement of the effect of signal separation are put forward.With this method applied the separation of the AM sine pulse from the ideal chaotic signal and from the measured reverberation of the lake bottom are implemented. Results show that under some condition this method is effective for the separation of ideal chaotic signal from pulse signals, and the separation effect of measured reverberation from some pulse signal is very good except that the middle frequency of one signal is close to that of the other signal.