Abstract: During Yan an period,the cause of cooperative was a great project,which was created for meeting economic development and the interests of the majority of the people according to the actual development of productive forces,and the purpose is to develop the economy and consolidate the political power in Shaan-Gan-Ning Border Region.In the border area,the cause of cooperatives had experienced three main changes,that is,from small to large,from public to private and then running by private with public support,a...