Based on the research at home and aborad,this thesis proposes modality iconicity,which states that the use of language is shaped by psychological motivation,with the correspondance of linguistic form and its content as its manifestation.

Mass events are serious social events participated by various kinds of people who have unique characteristics in psychological motivation, process of psychological development and psychological effect.

Curiosity and its release or satisfaction is always the psychological motivation for the writing and reading of novels in China, as was realized by the ancients long time ago.

Code-switching in short messages has high frequency and various types and it is restricted and influenced by social motive and psychological motive.

Code-switching,as a cross cultural communicative strategy in language contact,is not only restrained by grammatical rules,but also by social-cultural and psychological factors,such as race,sex,age,social position,educational background,and the convergence or divergence of their language selection.

It manifests itself in the traits of subject, the psychological motivations and the practical approaches.