Abstract: The conventional monitoring method based on timefrequency analysis is difficult to recognize the spectrum overlapping radio signals under the condition of battlefield complex electromagnetic environment. A blind monitoring technology for electromagnetic spectrum management is proposed. The blind source separation(BSS) technique is analyzed theoretically and the blind monitoring model based on the algorithm of maximum signal-to-noise ratio is given. Applying the processing model, simulation is performed to separate and extract the six spectrum overlapping radio signals. The simulation demonstrates the presented BSS processing model can be used to monitor and analyze spectrum overlapping radio signals and enables a means for signal recognition. The parameters of radio equipment such as frequency, signal type, bandwidth and so on can be judged using the method.