The writer of this paper,beginning from the establishment of standard,thinks that,based on the phoneme of Mandarin Chinese and IPA,errors and defects should be judged from the phoneme and non-distinctive features.

Based on fundamental theories of English phonetics and phonology,the paper gives a relatively comprehensive account of English consonant cluster s structure and phonetic features from the perspective of the definition,cause,and formulation of neutralization of English consonants as well as their distinctive features and oppositions.

The article approaches the issue from the perspective of iconicity in order to probe into the distinctive features of sexism in English language from different aspects: marked iconicity,number iconicity,order iconicity,range iconicity and metaphor iconicity,so as to reveal its social origin.

It is one of the important claims of phonological theory that all speech sounds are not indivisible wholes but can be decomposed into sets of distinctive features.

Their distinctive features are more complicated.

Based on investigating the various dialects of Jiangsu province, the author puts forward an effectively correcting pronunciation method in foreign language teaching: to take the distinctive features theory as criterion in correction of the pronunciation errors made by the adult students from this province.

The distinctive feature theory is the key part in phonemics.

At the same time,pay more attention to the principle of extending the meaning of words,to the distinguishingly sememe,to the formal sign and the combinatorial features.