The ancient population had a high mortality rate, in addition to normal death, there were wars, plagues and natural disasters. The increased ability of modern society to access resources is a reproductive superiority and a survival superiority, resulting in an increase in the birth rate, a sharp decline in the death rate and a sharp increase in the world population, which cannot be sustained in the long run. In the end, there are two possible outcomes, one is the depletion of living resources, environmental degradation, and a renewed increase in mortality. The warning of population explosion has long been sounded, but there is no sign of significant improvement, long this go on our humanitarian will not be sustainable. The second is that human beings actively limit the birth rate, when human fertility is no longer excessive, the principle of human survival struggle can be rewritten. However, this rewriting will not be aimed at all groups of people, most people groups will still adhere to the principle of struggle for survival, such as government officials, celebrities, artists, teachers, entrepreneurs, professional managers and farmers. Some groups can be exempted from resource restrictions, such as housewives and people who enjoy the minimum living allowance. Some groups will extend to all of humanity, such as college students, football fans, amateur chess players, amateur artists, the crowd of gentle people, the crowd of loyal, honest people, etc.

（3）The Principle of Generalized Evolution of Human Groups:

Major premise: Inferior variation of human groups is easy to be eliminated, superior variation is easy to survive and pass on to other people.

Minor premise: The majority of the human groups is bound to eliminated.

Conclusion: The inferior variation of the human groups must be gradually eliminated, the superior variation can survive and pass on to others.

This principle has dominated the whole history of mankind in the past, but now no gentle person want to see mankind pay too cruel a price for progress. Progress and humanism are a contradiction that is difficult to balance. If some people groups no longer have to struggle for survival in the future, then it will be difficult for them to evolve, but the good news is that other people groups who have to struggle for survival will continue to evolve.