Because of the increasing international image of China, the translation of public signs in city has become the very important issue. From the point of view of cross-cultural communication, the public signs have crucial influence on the image of the city, even for the whole China. However, there exist many translation errors of the public signs in China. This paper makes some research and analysis on the Chinese-English translation of public signs. On account of the current situation of public signs' translation in China, and take the characteristics and function of the public signs into consideration, this paper proposes some main principles and strategies which public signs' translation should pay attention to.