The reasons for India's large population are as follows:

1. Geographical factors: vast Indus-Ganges plain, rich water resources and tropical monsoon climate.

2. Cultural factors: Hindu and Muslim concepts of fertility and marriage, and the strong influence of village culture. The contest between all cultures is, in the final analysis, the contest of fertility culture.

3. Historical factors: it has a long history of development, in which a relatively strong national organization system has been formed, which is very effective for agricultural material production and promoting the development of backward areas.

4. Modern factors: the application of modern agricultural technology and water conservancy facilities has greatly increased the population capacity of India; Unfavorable implementation of contraceptive measures; The cost of raising a child is too low, at least the cost it is willing to spend is very low.

5. Economic factors: the economic development is not strong enough to ensure that other industries other than agriculture can accommodate enough employed people.

6. Educational factors: The education popularization rate is low, especially for women. Looking around the world, countries with developed compulsory education have extremely low fertility rates. Therefore, the best way to reduce a country's population is not family planning, but education, especially for women.