Based on the principle of quantum mechanics, this paper made an analysis of the state of the earth core matter and calculated the following parameters: the average value of the communal electrons in ultra solid matter of earth core, the concentrations of communal free electrons in earth core matter, the average movement velocity of free electrons in modern earth core, the critical value of self gravitation pressure that produces quantum effect of earth core matter at the early stage, the self gravitation pressure that leads to the beginning of the overall expansion of the earth, the energy required for the generation of ultra solid state, and the energy for satisfying the generation of ultra-solid quantum mechanic effect in the earth core. It is demonstrated that the inner earth core matter is a special kind of matter state ultra-solid state formed in a superhigh pressure environment. When the quantum rejection pressure produced by the earth core ultra solid state exceeds the critical value of the earth's self-gravitation contraction pressure, the overall expansion of the earth takes place, and hence the corresponding tectonic dynamics is called quantum earth tectonic dynamics.