With the acceleration of China's urbanization and Industrialization, a large flaw of rural surplus labor forces have left their lands and home-villages for enterprises owned by villages and small towns, and then become a special population which are neither same with conventional peasants nor same with urban residents. The forepassed old-age supporting way, "depending on land and family", does not fit these population.Because of the difficulties from benefits coordination and management, they have not been covered under urban social pension plan.Therefore, it is necessary to build a specific pension plan for them.