However, the ability to speak English with correct pronunciation and intonation is important as it will directly influence appropriate communication during the conversation. The phonology of English will be strongly influenced by Mandarin, which is usually used in the home environment by Chinese people (Phoon, 2010). Some English words are made up of long vowels and short vowels. If people mispronounce the word, it will lead to misunderstandings and miscommunication. 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 has more vowel sounds than Chinese, resulting in mispronunciation of words such as ship/sheep, it/eat, and full/fool (Rasmussen, 2010). For example, Chinese students do not distinguish long [I:] from short [I] and tend to maintain the same length when they articulate them in different words, such as (sheep) /ʃI:p/ and (ship) /ʃIp / ( Han, 2013). The present study mainly focuses on vowel sounds which are long vowels and short vowels. It aims to determine the pronunciation errors and factors experienced by undergraduate Chinese students at UTAR