This paper aims to use Optimality Theory (OT) and P-map,two linguistic theories of recent origin,to analyse epenthesis in the English complex codas produced by native speakers of Beijing dialect and set up the corresponding interlanguage grammar.

Phonological motivations for the changes of the Chinese coda consonants;

With diachronic and synchronic comparisons, this article argues that the vowel of entering and nasal finals is steadier or more regular in change whereas vowel with no consonant ending is very unsteady.

Some stop endings of entering rhymes in Middle Chinese have been changed into lateral endings in Jianghuai(江淮) dialects today,and their vowels are always high.

Experimental studies of Chinese nasal finals;

Historical comparison method internal testification are adopted in this thesis, which are based on the diachronic and synchronic comparison among the nine rhyme maps which show Chinese (north Chinese) to study how consonant rhythm-end.