This paper reports the application of mother tongue on English teaching in junior middle school. For a long time, English teachers have a misunderstanding of the role of the mother tongue, in other words, mother tongue should be excluded from the teaching process. However, learning with the help of your mother tongue is an effective learning strategy, which should be affirmed. This thesis expounds the application of mother tongue from three aspects. The first is the current situation of English learning in junior middle school. The second part is mainly about the application of mother tongue in junior English class, and the third part tries to give the method to deal with the mother tongue in English class ,that is students should know the differences between Chinese and English in language system and cultural background.