Space-time view is the cornerstone of physics, which can be divided into two categories. One is the absolute space-time view, it is a description of pure and real space-time. Because there is no a space with nothing, the absolute space-time view will deviate from the actual measured value quantitatively. The second is the view of material space-time, which is the result of observing the world through some medium. The principles of cosmology play an important role in the view of material space-time. The relativistic space-time view is a material space-time view, its material basis is the physical vacuum, that is, ether. The invariability principle of light velocity is intrinsically related to the principle of cosmology.