However, the ability to speak English with correct pronunciation and intonation is important as it will directly affect proper communication in conversation. The phonology of English will be strongly influenced by Mandarin, which is usually used at home by the Chinese (Phoon, 2010). Some English words consist of long vowels and short vowels. If people mispronounce the word, it will lead to misunderstandings and communication problems. According to Zhao (1995), Chinese speakers tend to reduce the contrast between long and short vowels in English, and diphthongs are like long vowels, so Chinese-influenced diphthongs will also be short. English contains more vowels than Chinese, leading to mispronunciation of words such as ship/sheep, it/eat, and full/fool (Rasmussen, 2010). For example, Chinese learners do not distinguish long [I:] from short [I] and tend to keep the same length when articulating them with different words, such as (sheep) /ʃI:p/ and ( ship) /ʃIp. / (Han, 2013). The present study mainly focuses on vowels which are long vowels and short vowels. It aims to determine the pronunciation errors and factors encountered by UTAR undergraduate students in Chinese.