Diversity of regional dialects is great in China.This paper is going to focus on one of the Guanyu dialect——Sichuan dialect. As the mother tongue,the dialect often influences the learners' phonetic learning of English.Through recording, this paper aims to analyze the differences between the pronunciation of Sichuan dialect and that of English, looks into the negative transfer of Sichuan dialect on English phonetics learning. And this paper will only focus on monophthong.