Viterbi demodulation theory was introduced and analyzed .A CPM simulation mod-el was built using Matlab .The simulation results showed that when BER was 10 -4 , viterbi technique could improve the detection performance by 3 dB compared with the traditional de-modulation technique .The FPGA implementation were finished on Quartusll -9 .0 of Altera Company , which provided a reference model for the next step in realization .%对CPM系统中一种基于最大似然准则的维特比解调算法做了分析．并建立了CPM系统仿真模型，仿真结果表明，在误码率为10-4情况下，该方案性能比传统限幅鉴频技术提高约3 dB．最后在可编程逻辑器件开发环境QuartusII-9．0平台完成了整个算法FPGA设计，为工程实现提供了参考．
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