After the war, due to the adjustment of industrial structure, a large number of rural surplus labor force had to face the risk of high accidents in cities. Since then, due to the intensification of overcrowding in big cities and depopulation in rural areas, it began to gradually promote the convection between urban and rural areas in the 1990s to save the decadent rural society.In the two rounds of urban and rural changes, Japan supported farmers to cope with the uncertainty of career transformation through a series of policies such as safety education and skill training, and provided all-round assistance for the career of new farmers after 2000. In the history of countermeasures for more than half a century, its core idea gradually condenses into the use of policy certainty to offset the great uncertainty of urban-rural changes.As far as China is concerned, the Enlightenment of this policy path can promote the mechanism of Co-Construction between officials and enterprises to deal with the uncertainty of career transformation, and in the work of rural revitalization, we can also refer to the measures of Japan's “community-reactivating cooperator squad” to help new farmers' de-embedding and re-embedding.