Teaching methods such as "Direct Method","communicative approach",etc.are very helpful in solving the common problem-"mute English"-among Chinese students.However,they also have some shortcomings.Using the students' "mother tongue" properly in teaching can help to overcome these problems and improve our teaching.First,contrasting the "mother tongue" with the "garget language",students can understand the "target language" more profoundingly.Second,the good and bad are intermingled in the class,so using the "mother tongue" in teaching,we can make sure those whose foreign language is weak can keep up.Third,in foreign language teaching,using "mother tongue" in analysing Abstract grammars and words can have better effect.Moreover,as for college students,the translation ability is also an important aspect in English learning.Using "mother tongue" in teaching can improve students' ability of transfering between the "target language" and "mother tongue",therefore,improve their translation ability.