This paper examines the basic demographic and labor supply characteristics of digital platform workers in China using drivers' survey data on U carhailing platform.A preliminary explanation of their differences in labor supply at the individual level is presented.The result shows that overall the platform workers do not provide a high level labor supply and their labor supply shows a dispersed distribution.There is also inconsistence in the distribution of labor supply intensity and labor supply continuity.Drivers' differences in education and hukou status can well explain their differences in labor supply intensity but fail to account for their differences in labor supply continuity on the platform.The competitive income on platform can well motivate drivers with lower education levels and non-local hukou,but it cannot explain the labor supply behavior of drivers with better education background.Digital platforms workers are featured by large internal heterogeneity.The issues of social risk bearing and social assimilation for digital platform workers call for more attention.