1.Rural-urban labor migration in China

The transfer of rural labourers to non-agricultural activities was going rapidly in recent years. The government also has explored the situation of rural migrants through survey，investigation or monitoring. It provides us some ideas about the true situation of rural migrants：There are about 120 millions rural laborers who leave their hometowns for off-farm jobs. Among them，about 100 millions rural laborers who migrate to urban areas，and cross-provincial rural migrants are about 60 millions（Liu Jun & Chen Lan，2005）. It is estimated that those rural migrants worked out of their hometown 8.3 months on average. Their average income is 6471 Yuan（$798）ever