中文摘要：

考虑由两个符号的非本原等长代换诱导的子移位．借助黄文、叶向东得到的一个结果，给出此子移位为Li—Yorke混沌的一个等价刻画．进而通过对点的渐近性态的探索，证明了任何这样的子移位都没有Schweizer—Smltal对．

英文摘要：

This paper considers the subshifts induced by those non-primitive constantlength substitutions on two symbols. With the help of a result obtained by Huang and Ye, the authors give an equivalent version for such a subshift to be Li-Yorke chaotic. Furthermore, by investigating the asymptotic behaviors of the points it is proved that each of the subshifts has no Schweizer-Smital pairs.