The ancient documents available indicate that the words of old Chinese seem to be mainly labic, but some poems whiten in Zhou Qin period, for example, these in Shi Jing and Chu Ci, record a large number of mono-morphemic disyllables, which are called lian mian n by Chinese scholars.

The disyllable conjunction ran er(然而)in Classic Chinese;

The variety of formants tracks of vowel of the first syllable in disyllables of mandarin is studied.

+da+noun" phrases in modern Chinese can be quantified,and they are mainly disyllable abstract nouns which can be classified according to subjects of　reason, characteristics, information, organization, event and tactic.

Contrasting the original of Erya with the annotation by Guo Pu,they were found that many important reasons for the appearance of disyllable.

During the mediaeval times came forth plenty of new words with new meaning,especially those disyllabic words,among which some were newly coined words and some others were old words taking on new meanings.

Pre research on the phonetic change of disyllabic adjective overlappings;

Firstly, the evolution from monosyllabic words to disyllabic monomorphemic words in Chinese-Tibetan has proved that monosyllabic words are protogenic.

This paper studies the syntactic and semantic features of the monosyllabic and disyllabic Desiderative-adjectives in Chinese.