Linguistic landscape in a city can not only serve as the informative signs in public area but also record the history and demonstrate the development and modernization with social order and community participation indication. It originates its researching base from social linguistics but develops as interdisciplinary in recent years stimulating deep interests with multi-perspectives. This thesis summarizes the features and developing trends of linguistic landscape researches in and abroad at the first. And with comparative study of typical traffic linguistic landscapes in Chinese and foreign cities, this thesis discusses the framework and categories of traffic linguistic landscape system and its improving role through different stages of time, focusing on the specific features and establishing principles of traffic linguistic landscape in Chinese urban cities.