本文运用信息论原理对选择生成器序列进行分析，得到时钟控制序列与钟控输出序列互信息为零的结果，即从选择生成器输出序列中得不到控制序列的任何信息，此外，还得到钟控输入与输出序列互信息的一个下界，所得结论可以为钟控生成器的设计者和分析者提供理论参考．

The sequences of Alternating step Generator are analyzed through the method of information theory and obtain some significant results. For example, the mutual information between clock-controlled sequence and clock-controlled output sequence is zero, i.e. one can’t get any information about clock-controlled sequence only from output sequence. Further, the lower bound of mutual information between clock-controlled input and output sequences is given. The results obtained can provide theoretic reference for designer and analyst who study clock-controlled generator.