English, as an international language, plays an important role in the communication between China and foreigners. However, the existence of Chinglish has a very bad effect on the quality of Chinese-English translation. So it is quite necessary to study Chinglish. To start with, this thesis introduces the definition of Chinglish on the basis of the former researches. Then, the causes of Chinglish are discussed. The thesis hopes that it can help people to improve the quality of the translation so as to communicate more effectively.