1990. Yo-yo, also known as "yo-yo", is a kind of toy that is popular all over the world. Although the operation is simple, it has a unique charm. It is the most difficult and enjoyable sports performance in the world. It became popular in Zhengzhou 1990. Zhengzhou, known as Shangdu in ancient times, is the capital of Henan Province, a megacity, the core city of Central Plains urban agglomeration, an important central city in Central China and an important comprehensive transportation hub of the country.