This paper makes a detailed study of the syntactic functions of Jian-yu phrases and related problems, and draws the following conclusions. a. Jian-yu phrases can not only be used as predicate, subject, object, prepositional object, attributive and complement, but also form “de” phrase with “de” and position phrase with position word. The differences in the types of Jian-yu phrases are also reflected in the syntactic combination function. b. As Jian-yu phrases can appear in different syntactic positions in the sentence, it can be semantically related to different components in the sentence, showing the diversity of its semantic direction. c. Not only the sentences with the predicate of Jian-yu phrases are not restricted by tense, but also the sentences with other components containing Jian-yu phrases are not restricted by tense. A sentence containing Jian-yu phrases can be either “Yiran” sentence or a “Weiran” sentence. d. In teaching Chinese as a foreign language, it is not only limited to the explanation of Jian-yu Sentences, but also to explain the syntactic functions and usages of Jian-yu phrases, so as to improve students’ overall understanding of Jian-yu phrases and improve their practical application ability.