Abstract:This paper aims at examining the perception of English tense and lax vowel contrasts by testing an identification task of CVC syllables with different manipulated durations in Chinese learners of English.This can provide some empirical evidence for English as a second language teachers in teaching second language pronunciation. Abstract: This paper aims at examining the perception of English tense and lax vowel contrasts by testing an identification task of CVC syllables with different manipulated durations in Chinese learners of English. This can provide some empirical evidence for English as a second language teachers in teaching second language pronunciation.