Situated in the contemporary debate over the implications of the Internet to the contentious politics and authoritarian states, this study is an empirical investigation into the mechanism and the determinants of cyber-to-physical mobilisation in contemporary China. This research compares the mobilization processes of the two cyber-contentious episodes in China, namely the Xiamen PX Event in 2007 and the Sanlu Milk Scandal in 2008. It is grounded on a two-year cyber-ethnographic investigation and in-depth interviews with 14 people differently involved in the respective cyber-contentious episodes. In order to find out why some contentious activities are able to transform into street protests while others of similar nature are contained or even vanish in the cyberspace, this study examines the interactions between the four stakeholders in each contentious episode (i.e., the cyber-protesters, the media, the state power, and the market forces). It highlights the importance of the state power and the market forces in cyber-to-physical mobilisation, and determines the conditions under which cyber-to-physical mobilisation is feasible. This thesis elucidates how the state power and the market forces collectively condition cyber-to-physical mobilisation through the media (both the print and the digital media). The entire mechanism is powered by the tensions between cyber-protesters, the media, the state power and the market forces. The media framing of an incident influences the grievance formation of cyber-protesters, which further determines cyber-to-physical mobilisation. Thus, by manipulating the media framing, the state power or the market forces may control cyber-to-physical mobilisation, although it is not always a success. Based on the mechanism for cyber-to-physical mobilisation, this thesis further ascertains the conditions for cyber-to-physical mobilisation. The two contentious episodes show that cyber-to-physical mobilisation is prohibited when the respective core interests of the state power and the market forces are in complete unity (i.e., national mobilisation and industrial damage are eminent). On the contrary, if cyber-to-physical mobilisation merely triggers controllable regional mobilisation, the state will tolerate it; and if cyber-tophysical mobilisation only costs limited corporate damage, the market forces will allow it. Under such circumstances, cyber-to-physical mobilisation is possible. / published_or_final_version / Sociology / Master / Master of Philosophy