Liangshan Yi Autonomous Prefecture of Sichuan province is the largest inhabited area of Yi people. Affected by the local economic conditions, teaching facilities, thinking mode and many other factors, including the diglossia environment, Yi Students' English learning is relatively backward. With the development of curriculum reform throughout the country, minority areas also follow the pace of the new curriculum reform. However, due to the backward of the teaching level, it is pretty hard for them to achieve the goals of the curriculum. Taking Puge Ethnic Middle School as an example, according to the result of the questionnaire and interviews, this paper will analyze the exiting problems and put forward some corresponding countermeasures to promote the level of middle school English teaching in Yi region.