As a category of phrases,strange-toned phrases favored by men of letters initiated at the junction of Southern and Northern Song Dynasties and found its development at the Ming Dynasty with its form of construction changing from the former loose organization to relative integration and clarity,its materials broadened,and dramatic factors relatively increased.

Based on the theory of lexical memes,this paper depicts the internal and external semantic structure of the group system of suppletives,and reveals the co-existence of morphological isomorphism and non-morphological isomorphism in the internal structures of suppletives groups,which helps to standardize,teach and apply suppletives.

At present, much attention has been paid to tiding up the heterographs, but the attention paid to variant idioms of heterographs is not enough.

There exsit great divergences on the definition of the heterograph in the academic circle of Chinese language.

The heterograph is nonsense variant of lexeme.

This article analyses quantitatively the following five groups of variants of Chinese character included in《Modern Chinese Dictionary》“xihan 希罕—稀罕”、“xiqi 希奇—稀奇”、“xishao 希少—稀少”、“xishi 希世—稀世”and“xiyou 希有—稀有”,expounds the reasons of selecting different words and tells the function of the two words in different forms.

This paper focuses on the Variants .