According to petroleum geology evolution of several typical Tertiary basins in the east of China, the process of basin evolution may be divided into three stages of whole descending, whole ascending and whole adjusting.

One fault, moves and the other fault does not move, so the single main shock type is formed when the internal angle region of conjugate faults is located in compressive stress region and there exists the adjustment unit of adequate size in the intersection region of Conju gat.