How many years does the Expo take place? Where have they been held?

World's Fairs are held every 5 years;

1851 London World's Fair.

1853 New York World's Fair.

1855 Paris Universal Exposition.

1862 London World's Fair.

1867 Paris Exposition Universelle.

1873 Vienna World's Fair.

1876 Philadelphia World's Fair.

1878 Paris Exposition Universelle.

1889 Paris Exposition Universelle.

1893 Chicago World's Fair.

1900 Paris Universal Exposition.

1904 St. Louis World's Fair.

1915 Panama-Pacific World's Fair.

1926 Philadelphia World's Fair.

1930 World Exposition of Industrial Science in Liège.

1933-34 Chicago World's Fair.

1935 Brussels World's Fair.

1937 Paris Exposition Universelle.

1939-40 New York World's Fair.

1939 Golden Gate World's Fair.

1958 Brussels World's Fair.

1962 21st Century World's Fair, Seattle.

1964-65 New York World's Fair.

1967 Mongolier World's Fair.

1970 Japan World Expo.

1975 Okinawa Marine Expo.

1982 Knox William International Energy Fair.

1984 New Orleans International River Fair.

1985 International Science and Technology Fair.

1986 Vancouver International Transportation Fair.

1988 Brisbane International Leisure Fair.

1990 International Flower & Green Expo.

1992 World Expo Seville.

1992 Genoa International Ship & Marine Exposition.

1993 Daejeon International Exposition.

1998 Lisbon International Fair.

2000 Hannover World Exhibition.

2005 Aichi World Expo.

2010 Shanghai World Expo.

Expo Milano 2015.

The World Expo is held once every few years, and the World Expo is an international expo event with great influence and long history organized by the host country or entrusted by the relevant departments. Exhibitors present to the world the achievements of contemporary culture, technology and industry that have a positive impact on various aspects of life.

Registered (also known as comprehensive) World Expos, which have been held every five years since 2000; Accredited (also known as professional) expos can be held at any time between two registered expos.

World Expos are generally held in two categories, one is called comprehensive World Expo, and strictly speaking, it is called a registered World Expo. The other category is called professional world expos, also known as recognition world expos. The former is about the content of the scope of the force, the scale is also larger, the exhibition time is often five to six months, the latter exhibits the content of the force is professional, such as the ocean, environment, transportation, information, horticulture, China's 1999 World Expo held in Kunming is a professional expo, the theme of horticulture.

And the 2010 World Expo we bid for this time is a comprehensive World Expo. According to the regulations of the Bureau International des Expositions, a comprehensive World Expo can be held every five years since 1995, and one or two specialized World Expos can be held between two comprehensive World Expos.

World Expos are divided into two forms, one is a comprehensive World Expo and the other is a professional World Expo. The World Expo is an international expo event with great influence and a long history organized by the host country or entrusted by the relevant departments. Exhibitors present to the world the achievements of contemporary culture, technology and industry that have a positive impact on various aspects of life.