In order to have a better understanding on the nature of the exosphere of a planet, the characteristics of the surface and the solar wind interactions are also important issues. In this work, the surface thermal model, 2D and 3D exospheric models, and the 3D hybrid model are applied to the studies on the exosphere and the magnetosphere structures of Mercury. Although initially we have treated each topic separately, the ultimate objective is to apprehend the elements, with solid, gas, and plasma states, of a solar system object without an atmosphere as a whole.