The sequence which corresponds to the first-order sea-level cycle is called the first-order sequence, and the first-order sequence may have an internal relationship with the galactic year cycle, in other words, the galactic year cycle may control the first-order sequence macroscopically. The superevents in the Phanerozoic, such as the concentration change of atmospheric gas carbon dioxide, the alternation of "calcite sea" and "aragonite sea" in the hydrosphere, and the reversal of magnetic poles, are cyclical. They have obvious correlation in genesis, and they are likely to be controlled by the complicated genetic relationship between galactic annual cycles and various superevents. Over the years, researches have shown that when the solar system moves around the galactic center, the acceleration of gravity (value of G) changes accordingly, and the solar system expands (or shrinks). The Earth, a member of the solar system, forms a change in potential energy and absorbs (or releases) heat. At the same time, the gravitational differentiation changes as a result of the value of G change, which leads to the expansion of the mantle and the contraction of the core; when the energy accumulates to a certain degree, the superplume will be activated, which will affect the plate pattern on the earth. In recent years, the periodic changes of these superevents in Phanerozoic have attracted extensive attention and discussion. Paying attention to these wise understandings and existing problems will provide important thinking process and research clues for in-depth research.