本文以语用为视角，在语篇的层面上尝试性地探讨了运用倒装句的语用理据。我们 认为，倒装句是由相应的常式句派生而来的变式句，可以分为强制性倒装和非强制性倒装两 大类。在语言的实际运用中，制约倒装句的选择和使用的语用理据有语境、话题延续性、焦 点化等。这些语用理据相互联系，共同对倒装句起着综合的语用制约作用。 This thesis, from the perspective of pragmatics, tentatively explores the pragmatic motivation of using flip-flops at the discourse level. In our opinion, inverted sentence is a variant sentence derived from the corresponding regular sentence, which can be divided into mandatory flip and non-mandatory flip two categories. In the practical application of language, there are contexts, topic continuity and focus on the pragmatic reasons that restrict the choice and use of the inverted sentences. These pragmatic motivations are interrelated and play a syntactic pragmatic restraint on flip-flops.