International Labor Day, also known as May 1 International Labor Day, Labor Day, and International Demonstration Day, is the Labor Day of most countries in the world. Labor Day is a holiday set up to commemorate the hay market incident in 1886 when Chicago laborers in the United States fought for an eight-hour work system and were armedly suppressed by the police.

May 1 is a legal holiday in many countries in the world, and in most cases it is "Labor Day", "International Workers' Day" or similar names. Although some countries celebrate Labor Day on other dates, for example, the United States and Canada celebrate Labor Day on the first Monday in September.

On September 18, 1999, the State Council of the People’s Republic of China issued the "Decision of the State Council on Revising the "National New Year Holidays and Memorial Day Holiday Measures", which was the first revision of the "National New Year Holidays" issued by the State Council of the People’s Republic of China on December 23, 1949. "The Holidays and Anniversary Holiday Measures" stipulates that the annual "May Day" is statutory as a three-day national holiday with the Spring Festival and National Day, plus the two weekends before and after the adjustment of the holiday for a total of seven days, forming three "Golden Weeks." On December 14, 2007, the State Council of the People's Republic of China revised the "National New Year's Day and Memorial Day Holiday Measures" for the second time, adjusting the "May Day" from three days to one day, and the May Day Golden Week will also become history. Since the law came into effect in 2008, the May Day holiday plus a weekend break has become a three-day small holiday. Mainland China holds a large-scale workers' party every May 1st Labor Day.