Abstract: Since the reform and opening, a large amount of surplus labors in countryside have been moving to cities. The peasants working in cities have made great contributions to the socialist construction. Although they have an advantage in physical strength, endurance and age, they are poor in education and laboring skill and slow to adapt to the new technology. Under the background of practicing the view of scientific development and constructing a harmonious socialist society, we should optimize the current training system of migrant workers. Nevertheless, this cannot be done without the legal guarantee.