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Aimed at theSproblem that theSdemodulation threshold ofSnon-coherent demodulation technologySof PCM/FM telemetry system using frequency modulation inStheSpresent situation of aerospace measurement and controlSis higher,Sresearch a kind of multiple symbol detection based on maximum likelihood thought (Multi - Symbol Detection, MSD) demodulation method. This paper introduces the principle of multiple symbol detection and aiming at the shortcomings of the previous synchronization method, studies a kind of symbol decision process and synchronization of the combination of synchronization method. Simulation and test results show that based on MSD demodulation PCM/FM signal is a very effective method. For the development of the next generation of remote sensing signal demodulation system has important application value.