Since November 16,1918 when Cai Yuanpei shouted the slogan that“labor is sacred”,the labor issues have gradually become the focus of the May Fourth intellectuals.With the historic development of the May Fourth Movement,labor discourse gradually changed from general discourse to revolutionary discourse of the liberation of the working class.There are many factors shaping this discourse,such as the era characteristics,the contradictory development of Chinese real society and so on.Among them,the rational consciousness of the advanced intellectuals is undoubtedly a very important factor.In some sense,the process of labor discourse conversion is also the process of the advanced intellectuals of the May Fourth Movement to accept and turn to Marxism,which was chosen by history.With the founding of the Chinese Communist Party in 1921,a new era of Chinese revolution began.