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Communication signal modulation recognition of the basic tasks of identification and more signals in the noise environment and under the conditions of the received signal to determine the modulation and other signal parameters, so as to further analysis and provide the basis for signal processing. In this paper, in-depth study of the analog modulation signal format of the principle of recognition technology, the development of the status and the current advanced recognition technology, and at the same time designed to identify a set of programs for different modulation signal simulation and classification system to identify. MATLAB-based software platform for the simulation of the basic modulation signals simulation testing to determine the discrimination threshold, by calculating concluded that the successful identification of the AM, DSB, SSB and FM signals four. Experiments in the SNR> 12dB can be achieved when 90% of the standard to identify the correct rate of recognition programs designed to prove feasibility.