The syntactic structure 'Personal pronoun + Vgan' is a special category of discourse markers. Due to the semantic restriction of 'Ting', it only can match with 'Ni' to constitute the clause of 'Ni Ting' group as discourse markers.We take 'Ni Ting' 'Ni Ting ting' 'Ni Ting zhe' 'Ni Ting wo shuo' as examples.It finds that clause of 'Ni Ting' group as discourse markers have two pragmatic function of text organization and interpersonal interaction.Cognitive mechanism,language analogy mechanism, lexicalization and grammaticalization are the main reasons for the clause of 'Ni Ting' group can grammaticalize to discourse markers.