Abstract: Under the effect of information and communication technologies, especially internet technology, the traditional research of geographic space which includes space form, geography things and time-space distribution regularities has changed. In order to study time-space distribution regularities of information dissemination in cyberspace，we proposed a new research method through news commentators' location information. Because Sina and NetEase both provided more accurate news commentators' location information, we chose them to carry out further study. In practical terms, we selected the same news in Sina and NetEase homepages’ important news section as the research object and analyzed the space-time distribution of comment authors and its influential factors. This research indicates that: ①The space-time distribution difference of news commentators in Sina and NetEase is very huge. ②Whether it is for Sina or NetEase, Spatial diffusion of news commentators are the diffusion model of scattered –point during the initial period, which means that it can quickly spread to several parts of the country in a very short time. After this initial period，spatial diffusion of news commentators then presented the diffusion model of non-full fills diffusion, which means that with the involved area is increasing,the most of the provinces in the final did not achieve full coverage. The space distribution of news commentators is not in line with the range attenuation law in traditional geographic, featured with crossing the space length in reality. ③Spatial distribution of news commentators is imbalance, namely the existence of a typical regional differences. The imbalance is not only existing among the four regions or the different provinces，but also includes diffusion index and number of news commentators.④Fictitious cyberspace is not the hyperspace that is completely isolated from the actual geographical space.The provinces distribution of news commentators on Sina or NetEase has geographic embeddedness and internet users, GDP and urban population are important factors affecting provinces distribution. ⑤There are many significant factors that influence the space-time distribution of comment authors such as website platform，behavioral habit of Internet users，time and internet equipments.