Under the frame of thought experiment, the concept of generalized particle which has variable volume or shape is proposed. The origin of the concept of the speed of light is analyzed. The impossibility of faster-than-light is discussed. The view that the universe originated from the split of an initial photon black hole is proposed. The quasars that are moving close to the speed of light are the first evidence to support the photon splitting model. The photon can be divided into high energy and low energy photon. The problems of arrangement and selection of photonic data are discussed. The concept of blackbody can be derived from the blackhole. The derivation process of the blackbody radiation formula based on MATLAB is introduced in this paper. The blackbody radiation formulae for low energy photons (i.e., the Planck’s formulae) can be obtained by adding a zero in the photonic data sequence; otherwise, the blackbody radiation formula, which includes high energy photons, is obtained, and the result tends to infinity. For the description of the ultimate fate of the universe, without introducing any other concepts or terms such as entropy, the photon splitting model plus the radiative heat transfer model can be used to obtain the conclusions which are equivalent to that from the theories of heat silence or dissipative structure. The dark matter particle (or simply, the darklet) model which is based on photon splitting is presented. The darklets are the second evidence to support the photon splitting model. A cycle model between the speed of light and the non speed of light is proposed for the evolution of the universe.