In July 1987, 1 1, a baby was born in the former Yugoslavia, which was symbolically recognized by the United Nations as the 5 billionth person on the earth, announcing that the population of the earth exceeded the 5 billion mark. The United Nations Population Fund (UNFPA) proposed that this day be designated as World Population Day of 5 billion. 1990, the United Nations decided to designate July 1 1 day as "World Population Day" to arouse people's attention to population issues.

According to the recommendation of the thirty-sixth session of the Governing Council of the United Nations Development Programme, in order to attract the attention of governments and people all over the world to population issues, the United Nations Population Fund requested governments and non-governmental organizations to carry out World Population Day activities during this period. From then on, all countries in the world should carry out publicity activities.

1995 February 15 at 0: 00, a baby weighing 3700g was born in Beijing Maternity Hospital, announcing the arrival of the120,000 th citizen of China. The distance from 1 April 989 1 1 population day is less than 2000 days, and the huge population train has added1100 million passengers.

199910 June 2002 12, the world population reached 6 billion, and the United Nations designated it as World Population Day.