The popular language refers to the reflection of the politics, economy, the social culture and the local conditions at that time. The popular language is not only one kind of social terminology; it has manifested the social development trend and the social value system to a certain extent, and disseminates the intense modernity social culture. Therefore, grasps to the popular language is helpful to update the content in teaching Chinese as a second language, lets teaching Chinese unites the time pulsation, and synchronizes society's progress. For teaching Chinese as a second language, the merit of popular language does not allow to neglect. The present paper plans to analyze and discuss the existence of the popular language from the internal and external cause, and further demonstrate the popularity, the originality, humorous, the efficiency, and iconicity, and so on, to prove the necessity of introducing the popular language in teaching Chinese as a second language.