With the opening of Chinese colleges and the frequent cultural communication among international colleges, Yuxi Normal University, as a local university, has developed very quickly. More and more public signs appear on campus, both in Chinese and English. But owing to various causes, many non-standard translations can be seen everywhere. From the aspects of commonly applied functions of public signs in colleges, this thesis analyses some common non-standard translations in directing public signs, restricting public signs and calling public signs, and proposes some suggestions on standard translation.