Life system is the typical self\|organization system,in which there are fluctuations in the diversity and complexity. Huge fluctuation displays eruption and mass extinction of life in biodiversity, while tiny fluctuations display a normal origin and background extinction. The continuous increasing of biodiversity is the inherent property of life system. Actual biodiversity is determined by natural selection. Low selective pressure makes for the spontaneity emergence of biodiversity, the excessively domin...