The multi-cultural background of pre-college ethnic minority students provides with a living model for developing second language teach-ing and related research.An investigation of the re-lationship between having a multi-cultural back-ground and English acquisition,and an analysis of its negative and positive influences will be helpful for improving the quality of teaching.In recent years,the research on college English teaching has been of concern both at home and abroad, and many books and articles related to this field have been published.These publications have provided an analysis on the status and main problems of col-lege English teaching with regard to course ar-rangement,teaching models,teaching methods,sys-tems of evaluation,and the specific needs of Eng-lish in society, etc.Some suggestions for English teaching reform have been proposed in order to solve some outstanding problems,such as the short-age of providing speaking-listening opportunities in English teaching,or the relatively poor communica-tion abilities of the students.In recent years, the cultural background of the students has been ex-plored ,which could have an important influence on English teaching.However, most of the research has focused on theoretical issues,and less on prac-tical useage.Moreover, there has been much less research on the influence and role of the pre-col-lege ethnic students'multi-cultural background. Hence,this article intends to start with the English level of the pre-college ethnic minority students, and,based upon an analysis of the different cultur-al backgrounds of the various students,explores the effect of English teaching within this background of cultural diversity.The purpose is to propose practi-cal and valuable solutions of these questions—how do teachers teach? And, how do students learn?The influence of the diversified cultural background of the pre-college ethnic minority students on their second language ( English) acquisition is obvious.