The physical model of thermonuclear reaction in Tokamak is mainly studied in this paper.Dynamics analysis based on the L-mode to H-mode transition near the plasma edge in the model, is an important of the study in Tokamak[1].In fact, L-mode to H-mode transition is the transition from low-energy limit mode to high-energy limit mode.As the control parameters and initial value conditions change, the stability of the vibrating particles near the plasma edge will change, and even produce some particles energy jump and lead to changes in energy near the plasma edge.