Based on the investigation of injury insurance of rural migrant workers in five cities of Hunan province in 2008, this paper analyzes behavior of economic man of interest groups, such as local government, employment enterprises, rural migrant workers themselves, work injury medical services and insurance agencies and so on. The results shows that, local governments and enterprises have a negative attitude due to the loss of labor cost advantage of rural migrant workers, increasing of poor employment environment and wages declining make some rural migrant workers hold hesitant attitude, medical...