The Theory of Despace is the most innovative cosmology with an opposite concept with respect to normal ones. This theory uses a very simple model to define the world and various kinds of forces and fields such as gravitation, electric field and magnetic field. Meanwhile, a new model of the photon was also built in this book. According to this new model of photon, we can describe the behavior and the effect of the photon to matter easily. The basic concept of this theory is that there is only one thing in the world - "space." The place without "space" forms what named "matter." This is totally contrary to what we have been taught and what we have ever though, but it can simply explain everything.