Abstract: Through the research on stress field of Chinese continent, displacement direction, constraint condition of speed rate and the collision of Indian plate towards Eurasian plate etc.,a unified tectonic dynamic model is presented. In order to make a further research, the study and description on mechanical system, unstability and mechanical model of many-body collision are carried out, in addition mechanical model is established. Finally,based on the research of unified tectonic dynamic model and mechanical model, numerical simulation study isconducted as well, dynamics process of the uplift of Qingzang plateau is analyzed and discussed accordingly.