In view of the issue of modulation of civil aviation communication signal,the traditional method of the signal demodulation is introduced,at the same time, the defect of the method is also pointed out. To overcome the defect, a new demodulation method is proposed,which is carried out as below:to the Minimum Shift Keying( MSK) demodulation,firstly,the symbol synchronization is completed and the sequence of samples of each symbol is separated, then, each symbol is mapped based on its characteristics of sequence of samples,and the demodulation is finished.The new method can resolve the problem of the traditional method very well and has a better capability.%针对民航通信信号的调制方式，介绍了该信号的传统解调算法，同时指出了传统算法存在的缺陷。针对传统算法存在的不足，提出了一种新的信号解调算法，即在最小频移键控（ MSK ）信号解调中，先进行码元同步，进而提取出每一个码元周期内的采样点序列，然后根据采样点序列的特征完成每一个码元的符号映射，从而实现解调。该算法很好地解决了传统算法存在的问题，并且在性能上也优于传统算法。
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