Abstract: Space and time are two fundamental dimensionalities that define human civilization and social development, and they jointly construct a basic configuration sequence system that can be wedged into any thinking pattern. The new information and communication technologies, represented by internet technology, have reconstructed the time-space relationship, among which the most representative is cyberspace that has overturned our view of time and space. Cyberspace contains geographical meaning and should be incorporated in the category of geography research, which has attracted attention of many geographers. Geographical research on cyberspace can be divided into three levels: external, internal and interaction. Based on the definition of cyberspace attribution, this thesis puts forward the systematic framework of its material construction and then analyzes its geographical connotations. The researches revealed that cyberspace is actually a virtual space composed of information, which is not only included in social space, but also within the category of geographical space. Cyberspace is constituted by three material elements such as information infrastructure, internet users and construction and management entity, which are also studied from the external perspective of cyberspace, thereinto, information infrastructure includes four parts, that is, network infrastructure, server, transcriber and internet equipments. There three elements are realistic materials, therefore, they have sites and locations, but different types of locations and definitions. Compared with the traditional definition of cyberspace by length, the definition by distance pays more attention to connection and time. The dimensions of cyberspace are not only world-wide, but also have changed the human’s cognition dimensions as media. Traditional definition by region has new connotations after external materials are added to cyberspace construction, and regional differentiation has new changes. Barriers and boundaries have new geographical meaning. Cities have evolved into information or even smart cities, and become the new elements for analysis of city network together with information infrastructures. Mapping cyberspace is the important way for us to understand and cognize the geographical connotations of cyberspace.