International Labor Day, also known as "May Day" or "International Workers' Day" , is a national holiday in more than 80 countries in the world. It is scheduled to be on the 1st of May each year. It is a festival shared by working people all over the world.

On May 1, 1886, more than 200,000 workers in Chicago, the United States, went on a general strike for the implementation of the eight-hour work system. After a hard and bloody struggle, they finally won. The workers'struggle has yielded gratifying results and their working hours have generally been shortened. Under the pressure of workers, some governments promulgated laws in favor of workers'interests, which strengthened the working class's confidence in struggle and accumulated valuable experience for the international workers' movement.

In commemoration of the great workers'movement, Second International declared “May 1 ”as “International Labor Day” every year.

In China, on May 1 in 1920, worker's crowd of etc. of Peking, Shanghai, Guangzhou city goes into the street to hold the huge parade of threatening force and hold a meeting. After new China establish, our country in December of 1949 will "5 1" settle for the legal Labor Day.