Abstract: Developmental pragmatics emphasizes children’s acquisition and exploitation of appropriate verbal and nonverbal forms to express verbal and nonverbal intentions or investigates the ways of the realization of communication goals in a specific context.It provides the opportunity and channel for understanding the whole process of pragmatic development of children with pragmatic impairment from the perspectives of knowledge, utterances and acts.The connotation and embodiment of perlocutionary act in speech act theory include levels of knowledge, utterances and acts.The paper focuses on the combination of perlocutionary act and research on pragmatic impairment at the departure of developmental pragmatics, the full expounding and interpretation of the restrictive mechanism of pragmatic impairment from the multidimensional perspectives and the theoretical foundations of the intervention strategies and training program.That the findings can provide references and inspirations for research on the rehabilitation of children with pragmatic impairment.